Every year around Raksha Bandhan and college farewell season, handmade gifts start trending hard on Instagram and WhatsApp groups. And one item that consistently gets people stopping mid-scroll is a resin broken heart keychain — two matching halves, one for you and one for your best friend or sibling. It's personal, it's pretty, and it costs almost nothing to make once you have the right mould and a basic epoxy setup.
The tricky part isn't the sentiment — it's getting both halves to actually match. Pour them slightly differently and one comes out darker, or one has bubbles while the other is crystal clear. This tutorial walks you through the full process, from choosing your resin type to demoulding two perfectly paired pieces that look like they belong together.
Whether you're making a single set for your best friend or planning a small batch to sell at your college fest or on Instagram, this guide covers everything you need. We'll also talk about colour combinations that photograph well and sell consistently during gifting seasons in India.
Quick Answer
Short on time? Here's the core of what this tutorial covers:
- Use a 1:1 or 2:1 epoxy resin for the broken heart keychain mould — UV resin works too for small single pours.
- Mix your coloured resin in one batch, then divide it equally between both mould halves so colours match exactly.
- Cure time: 24–48 hours for epoxy; 2–3 minutes under a UV lamp for UV resin.
- Use mica powder or alcohol ink for vibrant, translucent colours — avoid acrylic paint for clear pieces.
- The Broken Heart Keychain/Pendent Mould (2pcs) from Shrebhavi is specifically designed so both halves fit together after demoulding.
Why the Broken Heart Keychain Works as a Gift
The broken heart keychain concept is simple: one heart split into two interlocking pieces. You keep one half, your friend or sibling keeps the other. When the two are placed together, they form a complete heart.
This makes it one of the most emotionally resonant handmade gifts you can give at a college farewell or on Raksha Bandhan. It's not just a keychain — it's a physical metaphor for a bond that continues even after distance.
From a seller's perspective, it's also a smart product. You're selling a set, which means a higher price point than a single keychain. Buyers are also more likely to gift it with a small card, which increases perceived value further.
Materials You Need Before You Start
Gather everything before mixing resin. Once you start, you have a working window of roughly 20–30 minutes for most epoxy resins, so there's no time to hunt for a toothpick mid-pour.
- Broken Heart Keychain/Pendent Mould (2pcs) — the two-piece silicone mould designed for this exact project
- Epoxy resin (Part A + Part B) or UV resin
- Mica powder in two complementary shades (or one shade for a matching set)
- Measuring cups (two small ones, ideally graduated)
- Mixing sticks or silicone spatulas
- Toothpicks or a heat gun / lighter for bubble removal
- Keychain rings and jump rings (6–8mm works well for this size)
- Nitrile gloves and a mask — non-negotiable
- A flat, level surface to rest the mould while curing
- Wet-dry sandpaper: 400, 800, 1500 grit
- Resin gloss coat or nail top coat for final shine
If you want to make multiple sets at once, the 4in1 Heart Keychain/Pendent Mould lets you cast four hearts in a single session — great for batch production before a fest or sale.
Choosing the Right Resin for Keychain Moulds
This is where a lot of beginners go wrong. Not all resins behave the same way in small moulds, especially in Indian humidity and heat.
For a broken heart resin keychain, you have two main options:
| Feature | Epoxy Resin (2:1 or 1:1) | UV Resin |
|---|---|---|
| Cure time | 24–48 hours | 2–3 minutes under UV lamp |
| Clarity | Very high after full cure | High, but can yellow faster |
| Bubble control | Easier — more working time | Harder — cures fast |
| Colour mixing | Excellent — mix before pouring | Good, but mix quickly |
| Cost per piece | Lower for batch production | Higher per ml |
| Best for | Batch making, selling, beginners | Quick one-off pieces, detail work |
For this tutorial, we're using epoxy resin — specifically a 2:1 ratio (2 parts resin to 1 part hardener) which gives you a longer working window and better clarity for coloured pieces. If you're new to mixing ratios, read How to Choose the Right Resin Ratio for Your First Project: 1:1 vs 2:1 Explained for Indian Beginners before you start.
Also worth checking: UV Resin vs Epoxy Resin for Small Moulds: Which One Actually Works Better for Keychains, Pendants, and Jewelry in Indian Humidity? — it specifically covers keychain-sized pours in our climate.
Colour Matching: The Secret to a Paired Set That Looks Professional
This is the most important technique in this entire tutorial. If you pour each half separately with separately mixed batches of colour, they will not match. The pigment concentration will be slightly different each time, and you'll notice it immediately under light.
The fix is simple: mix one batch of coloured resin, then divide it equally between both mould cavities.
Popular Colour Combinations for Friendship and Sibling Gifts
- Dusty rose + gold mica shimmer — the most popular for Raksha Bandhan, photographs beautifully
- Ocean blue + silver flakes — great for college farewell, gender-neutral
- Lavender + holographic glitter — very popular with teenage buyers
- Black + red mica — edgy, sells well in college fests
- Peach + white pearl powder — soft and elegant, works for older buyers too
How Much Mica Powder to Add
For a translucent, glowy finish: add 0.5% to 1% mica powder by weight of your mixed resin. For a fully opaque, bold colour: go up to 2–3%. Start with less — you can always add more, but you can't take it out.
For complementary-colour sets (where each half is a different but coordinated colour), mix two separate small batches — one per colour — but keep the mica concentration identical so the pieces feel like a matched pair even if the hues differ.
Step-by-Step Casting Tutorial
This is the full two-piece resin keychain mould casting process. Read it once fully before you begin.
Step 1: Prepare Your Workspace
Work on a silicone mat or a sheet of plastic. Place your mould on a flat, level surface — even a slight tilt will cause the resin to pool to one side and create uneven thickness. Check with a phone spirit-level app if needed.
Temperature matters a lot. In Indian summers, your resin can cure faster than expected and generate heat in the mould. If you're working in May or June, keep the room below 30°C if possible. Read Deep Pour vs Thin Pour Epoxy in Indian Summers: Why Your Resin Overheats in May and What to Do About It for a full breakdown of this issue.
Step 2: Measure Your Resin
For a single broken heart set, you'll need about 8–12 ml of mixed resin total (both halves combined). Measure Part A and Part B carefully by weight, not volume — kitchen scales accurate to 0.1g are ideal.
For a 2:1 ratio: if you need 12 ml total, measure 8 ml of Part A and 4 ml of Part B. Mix in a clean cup for at least 3 minutes, scraping the sides and bottom. Undermixing is the number one cause of sticky resin.
Step 3: Add Colour
Add your mica powder to the mixed resin and stir gently. Avoid whipping air into the mixture — use slow, deliberate strokes. If you're making a two-tone set, divide the clear mixed resin into two cups first, then add different colours to each.
Step 4: Pour Into the Mould
Pour slowly from a low height — about 2–3 cm above the mould cavity. This reduces air bubbles. Fill each cavity to just below the rim; overfilling causes flash (thin resin edges) that needs sanding later.
If you're using a matching single-colour set: pour from one cup, alternating small amounts between both cavities so the level stays equal.
Step 5: Remove Bubbles
Wait 5 minutes after pouring, then pass a lighter or heat gun very briefly (1–2 seconds) over the surface. Bubbles will pop. Don't hold the heat too long — you'll scorch the resin or warp the silicone mould.
Alternatively, use a toothpick to gently pop visible bubbles. For the cleanest results, do both: heat first, then toothpick for any survivors.
Step 6: Cure Undisturbed
Cover the mould loosely with a box or container (not airtight) to keep dust off. Leave it on the flat surface for 24 hours minimum. Don't move it, poke it, or check it every hour — this is where patience matters.
At 24 hours, do a gentle press test on the back of the mould. If it still feels soft or springy, give it another 12–24 hours. Full hardness typically comes at 48–72 hours depending on your resin brand and room temperature.
If your resin is still tacky after 24 hours, check Why Your Resin Is Still Sticky After 24 Hours — and How to Fix It Before You Ruin the Piece — it covers the most common causes and whether the piece can be saved.
Demoulding, Sanding, and Finishing
Once fully cured, gently flex the silicone mould from the back and push each piece out from underneath. Don't pull the resin piece directly — you risk snapping a thin edge.
Sanding the Edges
Most demoulded pieces have a small seam line or slight roughness along the edges. Sand progressively: start with 400 grit (wet), move to 800, then 1500. Always sand wet — dry sanding resin creates fine dust that you should not inhale.
Drilling the Hole
If your mould doesn't have a built-in hole at the top, use a 1.5mm or 2mm drill bit at slow speed. Hold the piece firmly on a silicone mat. Drill straight — a crooked hole will make the keychain hang at an odd angle.
Adding the Keychain Hardware
Thread a jump ring through the hole, close it with flat-nose pliers, then attach the keychain ring. Use stainless steel or brass findings — they won't rust or tarnish, which matters if you're selling these pieces.
Final Gloss
If the surface looks slightly matte after sanding, apply a thin coat of UV resin or a gloss top coat and cure it. This brings back the glass-like finish and makes the colours pop in photos.
Selling Tips for Raksha Bandhan and Farewell Season
The broken heart resin keychain set is a natural fit for two peak gifting windows in India: Raksha Bandhan (usually August) and the college farewell season (March–May). Here's how to make the most of both.
Packaging That Justifies the Price
- Place both halves together in a small kraft box with tissue paper — the visual of the complete heart when the box opens is very effective.
- Add a small card that says something like "One heart, two pieces — for the distance between us."
- Wrap with a ribbon in a colour that matches the keychain for a cohesive look.
Photography Tips
- Shoot both halves together first (complete heart), then separate them for the second shot.
- Use a white or pastel background — it makes colours read true.
- Natural window light in the morning gives the best clarity for resin pieces.
Expand Your Range
Once you're comfortable with the broken heart mould, expand into related products. The Resin Heart & Music Keychain KIT gives you everything you need to add music-note themed keychains to your product line — great for college farewell gifts with a music theme.
For Raksha Bandhan specifically, the 12in1 Rakhi & Bracelet Mould pairs beautifully with the broken heart keychain as a combo gift set — the sibling gets a resin rakhi and a matching keychain half.
Pricing Guide
| Product | Material Cost (approx) | Suggested Selling Price | Margin |
|---|---|---|---|
| Single broken heart set (pair) | ₹30–50 | ₹180–250 | ~70–80% |
| Set with packaging + card | ₹60–80 | ₹300–350 | ~75% |
| Keychain + Rakhi combo | ₹90–110 | ₹400–500 | ~75–80% |
Safety Notes You Should Not Skip
Resin is a chemical product. It's safe to use with basic precautions, but those precautions genuinely matter.
- Always wear nitrile gloves. Resin sensitisation is cumulative — repeated skin contact can cause allergic reactions that get worse over time, not better.
- Work in a ventilated room. Open windows, run a fan pointed away from your work surface. Don't work in a closed room.
- Wear a mask when sanding cured resin — the dust particles are fine and should not be inhaled.
- Keep resin away from children and pets during the pour and curing phase.
- Dispose of used cups and sticks carefully — let leftover resin cure fully before throwing it out. Liquid resin should not go down the drain.
- If you get resin on your skin, wipe it off immediately with a dry cloth (not water first), then wash with soap.
Frequently Asked Questions
Which mould should I buy for a broken heart resin keychain set?
The Broken Heart Keychain/Pendent Mould (2pcs) from Shrebhavi is made specifically for this project. It comes as a two-piece set where both halves are designed to fit together after demoulding, so you don't have to cut or modify anything. The silicone is flexible enough for easy demoulding without damaging delicate edges.
How do I make sure both halves of the broken heart keychain match in colour?
Mix all your coloured resin in a single batch, then divide it equally between both mould cavities. This is the only reliable way to get a true colour match. If you mix two separate batches — even with the same amount of mica powder — the shade will vary slightly because hand-mixing is never perfectly consistent.
Can I use UV resin instead of epoxy for this two-piece resin keychain mould?
Yes, UV resin works well for the broken heart keychain mould because each cavity is shallow and small — UV light can penetrate fully. The advantage is a much faster cure time (2–3 minutes under a UV lamp). The downside is that UV resin has less working time, so you need to add your colour and pour quickly. For beginners, epoxy resin is more forgiving.
My resin keychain came out cloudy, not clear. What went wrong?
Cloudiness is usually caused by one of three things: moisture contamination (high humidity during pour), undermixing (the resin and hardener didn't fully combine), or curing too fast due to excess heat. In Indian monsoon conditions especially, humidity can cloud resin. Work in an air-conditioned room if possible, and ensure your mixing cups and tools are completely dry. Check Creating Unique Monsoon Decor: A Step-by-Step Guide to Using Silicone Molds with Resin for monsoon-specific tips.
How many resin keychain sets can I make from one batch of resin?
A standard 100g kit of epoxy resin (mixed weight) will give you approximately 8–12 broken heart keychain sets, depending on how full you fill each cavity and how much you lose to mixing waste. For batch production before a college farewell or Raksha Bandhan sale, use the 4in1 Heart Keychain/Pendent Mould to cast four hearts in one pour session and cut your production time significantly.
What is the best colour combination for a Raksha Bandhan resin friendship gift keychain?
For Raksha Bandhan, dusty rose with gold mica shimmer is consistently the top seller — it reads as warm, festive, and feminine without being too bold. For brother-sister sets where the brother might be less enthusiastic about pink, try navy blue with silver mica for one half and dusty rose for the other — complementary but distinct. If you're also making rakhis to match, the 12in1 Designer Rakhi Mould lets you create coordinated rakhi and keychain sets in the same colour palette.
How do I price my resin broken heart keychain sets to sell at a college fest?
At a college fest stall, ₹150–200 per set (both halves together, basic packaging) is a sweet spot — it feels affordable as an impulse buy but still gives you a healthy margin. If you add a small card and a kraft box, you can price at ₹250–300 and most buyers will pay without hesitation because the perceived value jumps significantly. Offer a small discount for two sets bought together — it encourages buyers to get one for themselves and one for a friend.
Wrapping Up
A resin broken heart keychain set is one of those projects that looks impressive but is genuinely achievable by a beginner with the right mould and a little patience. The key steps are simple: mix your resin carefully, colour it in a single batch, pour both halves from the same cup, and let it cure fully before you touch it.
What makes this project worth doing — beyond the joy of making something — is how well it sells. Friendship gifts with emotional meaning always find buyers, especially during Raksha Bandhan and college farewell season. A matching resin keychain set, packaged thoughtfully, is something people are genuinely happy to pay for.
Start with the Broken Heart Keychain/Pendent Mould (2pcs), pick a colour combination that speaks to you, and make your first set. Once you see how the two halves fit together after demoulding, you'll understand exactly why this design keeps selling.