Learn how to make pressed flower resin coasters without bubbles using dried flowers, thin layers, careful sealing, and beginner-friendly epoxy techniques.
Learn how to make pressed flower resin coasters without bubbles using dried flowers, thin layers, careful sealing, and beginner-friendly epoxy techniques.
Pressed flower resin coasters are one of the prettiest beginner resin projects because they turn small blooms, petals, and greenery into glossy pieces you can actually use. They also reveal every little mistake. A flower that still holds moisture can turn cloudy. A petal with trapped air can release bubbles overnight. A thick pour can make delicate stems float out of place.
The good news is that learning how to make pressed flower resin coasters without bubbles is mostly about preparation and patience. You do not need advanced casting equipment or a professional studio. You need fully dried flowers, a gentle sealing step, warm resin, thin layers, and a careful bubble check before the coaster cures.
If you are brand new to epoxy, read our Resin Art for Beginners guide first for basic safety and mixing habits. This tutorial focuses on the exact coaster workflow that keeps flowers clear, flat, and bubble-free.
How to Make Pressed Flower Resin Coasters Without Bubbles: The Short Answer
The best way to make pressed flower resin coasters without bubbles is to dry the flowers completely, seal porous petals before embedding, pour a thin base layer, place the flowers gently, release trapped air with a toothpick, then finish with a second clear layer. Keep the resin warm, stir slowly, and inspect the mold edges during the first 30 to 45 minutes of curing.
The biggest mistake is rushing straight from fresh flowers to a deep resin pour. Resin preserves what is already prepared well. It does not fix damp petals, thick flower centers, dust, or air pockets.
Supplies for Pressed Flower Resin Coasters
A beginner setup is affordable, especially if you already have basic resin tools. For a set of four pressed flower coasters, expect to spend about $40 to $90 if you are starting from scratch, or much less if you already own resin and molds.
Useful supplies include clear art-grade epoxy resin ($25-$45), glossy silicone coaster molds ($8-$20), pressed dried flowers ($6-$18), tweezers ($4-$10), toothpicks or silicone detail sticks ($3-$8), nitrile gloves ($8-$15), mixing cups ($8-$14), silicone stir sticks ($5-$10), a mini heat gun ($15-$30), clear-drying glue ($4-$9), and cork backing or silicone feet ($5-$10).
Choose a resin with a 1:1 mixing ratio, UV resistance, and a working time of at least 30 minutes. Fast-cure resin can work for plain coasters, but it is less forgiving when you are placing flowers and chasing bubbles. If you are still building your kit, our Resin Art Essential Tools guide can help you avoid buying supplies you will rarely use.
Choose and Prepare the Flowers
Pressed flowers must be fully dry before they go into resin. Even a little hidden moisture can create cloudy spots, discoloration, or tiny bubbles that appear hours after pouring. Thin flowers usually work best: forget-me-nots, alyssum, violas, pansies, larkspur petals, fern tips, baby's breath, Queen Anne's lace, and small leaves.
Avoid thick flowers for your first coaster set. Roses, daisies, carnations, and large flower heads can hold moisture in the center even when the outside feels dry. If you love those flowers, use individual petals instead of the full bloom.
You have two easy options:
Buy pre-pressed flowers: This is the most reliable beginner choice. Look for flat, dry flowers sold for resin, nail art, scrapbooking, or pressed flower crafts. Expect to pay $8 to $18 for a mixed pack.
Press your own flowers: Place flowers between parchment paper inside a heavy book or flower press for two to four weeks. Replace damp paper if needed. Flowers should feel papery and flat before use.
Before pouring, lay out your coaster designs on a white sheet of paper. This helps you see color balance and prevents decision-making while the resin clock is running.
Seal Pressed Flowers Before Resin
Sealing is the step many beginners skip, and it is one of the main reasons bubbles show up around flowers. Dried flowers are porous. When they touch liquid resin, air inside the petals and stems can slowly escape. That air becomes bubbles.
You can seal flowers in two beginner-friendly ways.
Clear glue sealing
Brush a very thin layer of clear-drying craft glue or decoupage medium onto both sides of the flower. Let the first side dry completely before turning it over. This creates a light barrier between the flower and the resin. Use a soft brush and avoid heavy coats, which can leave visible ridges.
Resin skim coat
Mix a small amount of resin and brush a thin coat over the flowers on a silicone mat or parchment. Let it cure before embedding. This gives the clearest look, but it takes longer and uses a little extra resin.
For most beginner pressed flower resin coasters, clear glue sealing is enough. If you are preserving meaningful flowers from a wedding, memorial, bouquet, or garden milestone, use a test flower first. Our guide on how to preserve flowers in resin goes deeper into drying and sealing choices for keepsake projects.
Set Up a Bubble-Free Workspace
Resin behaves better in a warm, calm workspace. Aim for a room temperature around 70 to 75 degrees F. Cold resin is thicker and holds bubbles more easily. If your resin bottles feel cool, place the closed bottles in warm water for 10 to 15 minutes, then dry them completely before opening.
Set your silicone coaster molds on a level surface. A tilted mold makes resin gather on one side, which can move flowers and create uneven thickness. Cover the table with a silicone mat, plastic drop cloth, or parchment paper.
Clean the molds before you mix. Dust, lint, glitter, and cured resin flakes can all create bubble traps or surface marks. Press painter's tape or clear packing tape into the mold cavity and lift it away. If your molds look dull or dusty, use the gentle routine in how to clean resin molds without losing shine before starting.
Place every supply within reach before mixing: resin, flowers, tweezers, toothpicks, heat tool, dust cover, timer, gloves, and paper towels.
Mix Resin Slowly and Let It Rest
Measure resin and hardener exactly according to the brand instructions. Most beginner art resins use a 1:1 ratio by volume, but some formulas differ. Inaccurate measuring can leave soft spots, stickiness, or cloudy patches.
Stir slowly for 3 to 5 minutes, scraping the sides and bottom of the cup. Slow mixing matters. If you whip resin like cake batter, you add hundreds of tiny bubbles before the project even begins.
For extra reliability, use the double-cup method:
1. Mix resin and hardener in the first cup.
2. Scrape the sides and bottom carefully.
3. Pour the mixture into a second clean cup.
4. Stir for one more minute.
After mixing, let the resin sit for 2 to 3 minutes. Many bubbles will rise to the surface. Pop them with a toothpick or a quick pass from a heat gun held several inches away.
Pour the Coasters in Thin Layers
Thin layers are the secret to clear pressed flower coasters. A single deep pour can trap air under petals, move your layout, and make flowers float. Two or three shallow layers give you more control.
First layer: clear base
Pour a thin clear layer into each coaster mold, just enough to cover the bottom. Use a toothpick to guide resin into the edges. Wait a few minutes, then pop visible bubbles. This layer creates a glossy front surface and gives the flowers something to rest on.
Second layer: flower placement
Place sealed pressed flowers into the resin with tweezers. Lower one edge first, then ease the rest of the flower down. This helps air escape instead of getting trapped underneath. If a bubble appears under a petal, use a toothpick to gently lift the edge and release it.
Keep flowers away from the very edge of the mold on your first attempt. Edges are where bubbles like to hide, and a little clear border makes the finished coaster look cleaner.
Final layer: clear top coat
Once the flowers are settled, add enough resin to cover them fully. Pour slowly along the side of the mold and let the resin flow across the design. Check the surface after five minutes, then again after 15 and 30 minutes. Use a toothpick around stems, petal edges, and mold walls.
If you want more general coaster bubble prevention, our how to make resin coasters without bubbles tutorial covers mixing, heat, and mold-edge checks in more detail.
Use Heat Carefully Around Flowers
A heat gun can pop surface bubbles, but pressed flowers are delicate. Too much heat can move petals, wrinkle sealed glue, push resin over the mold edge, or create waves in the surface.
Use short, gentle passes. Hold the heat gun about 6 to 8 inches above the resin and keep it moving. One or two seconds over each coaster is usually enough. Then stop and inspect with a toothpick.
A butane torch is optional, but beginners should be cautious. Flames can scorch dried flowers, damage silicone molds, or create fumes around alcohol-based colorants. For pressed flower resin coasters, a mini heat gun plus toothpick control is usually the safer choice.
Do not chase every microscopic bubble forever. Focus on large bubbles, bubbles under petals, and bubbles near the edge.
Cure, Demold, and Finish the Coasters
Cover the molds with a clean box, plastic storage bin, or dust cover. Leave them on a level surface for at least 24 hours, or longer if your resin label recommends it. Many epoxy resins feel firm after one day but reach full cure closer to 72 hours.
Demold slowly. Pull the silicone mold away from the coaster rather than bending the coaster sharply. If the coaster still feels flexible, wait another day before sanding or adding backing.
Finish the edges with wet-sanding if needed. Start around 600 grit for rough edges, then move to 1000 or 2000 grit for a smoother feel. Wipe clean and let dry. Add cork backing or clear silicone feet so the coaster sits neatly on a table.
Remember that many art resins are heat-resistant, not heat-proof. They can usually handle warm mugs, but very hot cups may leave marks, especially during the first week after curing.
Troubleshooting Pressed Flower Coaster Problems
Bubbles under petals: The flower was not sealed well, was lowered flat all at once, or trapped air underneath. Seal flowers, place them edge-first, and release air with a toothpick.
Cloudy halo around flowers: The flowers may have held moisture, or the sealer was too thick. Dry flowers longer and use thinner sealing coats.
Flowers floated to the top: The pour was too deep or the flowers were added before the base layer had enough grip. Use a thin base layer and let it thicken slightly before adding flowers.
Coasters cured bendy: The resin may be under-measured, under-mixed, too heavily tinted, or not fully cured yet. Wait 72 hours before judging. For more help, see how to fix bendy resin jewelry after curing because the same curing principles apply to small resin pieces.
Surface is dull: The mold may be matte, scratched, damp, or coated with soap film. Use glossy molds and make sure they are clean and fully dry before pouring.
Product Recommendations for Better Results
For the clearest pressed flower resin coasters, spend money on the supplies that directly reduce bubbles and cloudiness.
Best resin choice: A clear, UV-resistant, 1:1 art epoxy with 30 to 45 minutes of working time. Budget $25 to $45 for a starter kit.
Best mold choice: Simple glossy silicone coaster molds in round, square, or hexagon shapes. Budget $8 to $20. Avoid very detailed molds until you are comfortable controlling bubbles.
Best flower choice: Thin pre-pressed flowers designed for crafts or resin. Budget $8 to $18. Choose small petals and greenery for your first set.
Best bubble tool: A mini heat gun or embossing heat tool in the $15 to $30 range. Pair it with toothpicks for bubbles under petals.
Best finishing upgrade: Cork sheets, cork rounds, or silicone feet for $5 to $10. This makes handmade coasters feel more durable and gift-ready.
FAQ About Pressed Flower Resin Coasters
Do pressed flowers need to be sealed before resin?
Yes, sealing is strongly recommended. Pressed flowers are porous and can release air into the resin, which creates bubbles. A thin coat of clear-drying glue or a cured resin skim coat helps lock air inside the flower before embedding.
Why did my flowers turn brown in resin?
Flowers usually turn brown because they were not fully dry, were naturally prone to color change, or were exposed to too much heat. Press flowers until they feel papery, test delicate varieties first, and use gentle heat passes after pouring.
Can I use fresh flowers in resin coasters?
Fresh flowers are not a good choice for resin coasters. They contain moisture, which can cause cloudiness, bubbles, discoloration, and poor curing. Press and dry flowers completely before using them in resin.
How do you stop pressed flowers from floating in resin?
Pour in layers. Add a thin base layer first, let it thicken slightly, then place the flowers and cover them with a final clear layer. Deep single pours give flowers more room to drift upward.
What resin is best for pressed flower coasters?
Use a clear art-grade epoxy resin with UV resistance, a 1:1 ratio if possible, and at least 30 minutes of working time. A slower resin gives bubbles more time to rise and gives you more time to place flowers carefully.
Final Thoughts on Pressed Flower Resin Coasters
Once you understand how to make pressed flower resin coasters without bubbles, the project becomes calm and repeatable. Dry the flowers completely, seal them lightly, pour in thin layers, place each flower with care, and check for bubbles while the resin is still fluid.
Start with four simple coasters and a small mix of flowers. After one clean set, you can try wedding bouquet petals, garden herbs, seasonal colors, gold foil, or clear borders. Pressed flower resin coasters look delicate, but the process is very beginner-friendly when each layer gets the time it needs.