Learn how to prevent bubbles around dried flowers in resin by drying, sealing, placing, and pouring flowers with a simple beginner-friendly layered method.
Learn how to prevent bubbles around dried flowers in resin by drying, sealing, placing, and pouring flowers with a simple beginner-friendly layered method.
Dried flowers can make resin jewelry, coasters, bookmarks, and keepsakes feel wonderfully personal. Unfortunately, petals and stems also hide tiny pockets of air. Once the flower is covered with epoxy, that air can escape as a ring of bubbles, a cloudy patch, or one stubborn bubble beneath the center of a bloom. Learning how to prevent bubbles around dried flowers in resin is mostly a matter of preparing the flowers and pouring in layers rather than trying to rescue the piece with lots of heat.
The reliable method is simple: use completely dry flowers, seal porous petals, brush a thin coat of resin over both sides, place each flower into a shallow base layer, and inspect it from several angles before adding the final pour. These small steps give trapped air a route out while the resin is still fluid.
If this is your first epoxy project, review our Resin Art for Beginners Guide for measuring, mixing, ventilation, and curing basics. Then use the flower-specific process below to keep your inclusions clear and bubble-free.
How to Prevent Bubbles Around Dried Flowers in Resin
To prevent bubbles around dried flowers in resin, dry the flowers all the way through, apply a thin clear sealer, pour a shallow resin base, pre-coat the flowers with resin, and lower them into the mold at an angle. Use a toothpick to release air from beneath petals and flower centers. Wait a few minutes, check again, and only then add the remaining resin in a controlled layer.
The most important point is that heat alone is not the answer. A heat gun or torch may pop bubbles on the open surface, but it cannot reliably reach air trapped under a petal. Too much heat can scorch delicate flowers, make resin cure too quickly, damage a silicone mold, or create ripples. Preparation and placement do more than aggressive heating ever will.
Use this quick sequence for every flower project:
Why Dried Flowers Create Bubbles in Resin
Flowers are much more porous than they look. Petals contain fine veins, stems have hollow channels, and layered flower centers can hold air between dozens of tiny surfaces. Even a pressed bloom can contain microscopic pockets that release air after the resin begins to warm during curing.
Moisture is another problem. A flower may feel crisp on the outside while its center still contains water. Moisture can cause cloudiness, foaming, discoloration, or poor curing. Resin does not dry a damp flower safely; it seals the moisture inside. Thick roses, daisies, carnations, and woody stems need more drying time than thin petals or fern leaves.
Bubbles also appear when the flower is dropped flat onto resin. Air becomes trapped between the back of the flower and the mold, much like an air pocket beneath a sticker. Adding a deep layer immediately makes that trapped air harder to find and release. A shallow base and angled placement keep the flower visible while you work.
Choose Flowers That Are Easy to Embed
Beginners get the clearest results with thin, flat flowers. Pressed violas, forget-me-nots, alyssum, larkspur petals, baby's breath, fern tips, Queen Anne's lace, and individual hydrangea petals are easier to seal and inspect than dense whole blooms. Their flatter shape leaves fewer places for air to hide.
For your first project, avoid thick flower heads and succulent leaves. You can still use roses or daisies, but separate them into petals or dry them thoroughly with silica gel before embedding. Trim bulky stems and remove damaged material that might crumble into the resin. Pale flowers may become slightly translucent when wet with epoxy, so test one spare bloom before committing a sentimental flower.
Pre-dried flower packs usually cost $6-$18. A small flower press costs about $15-$30, while reusable silica gel for three-dimensional flowers generally costs $12-$25. Store dried flowers in an airtight container with a small desiccant packet until you are ready to work.
For a complete keepsake workflow, see our guide to Preserving Flowers in Resin.
Dry and Seal Flowers Before the Pour
A flower should feel papery or crisp, not cool, flexible, or leathery. Pressing thin blooms between absorbent paper typically takes two to four weeks. Silica gel can dry many flowers in three to seven days, but dense centers may need longer. Follow the drying product's directions and sacrifice a non-sentimental flower to check the center if you are unsure.
After drying, seal the flower to slow the release of air and help protect its color. Use a clear acrylic spray, clear-drying craft glue diluted to a brushable consistency, or a sealer made for paper and dried botanicals. A clear acrylic spray generally costs $7-$14; soft brushes cost $4-$10.
Apply two or three very light coats rather than one wet coat. Cover the front, back, outer edges, stem ends, and dense center. Let each coat dry according to the label, then allow the finished flower to dry completely before it touches resin. Heavy sealer can leave visible white patches or stiff drips, so practice on a spare petal first.
Sealing reduces bubbles, but it does not replace proper drying. Never use sealer to hide a flower that may still contain moisture.
Prepare Resin Without Adding Extra Air
Choose a clear art or casting epoxy with a working time of at least 30 to 45 minutes. That open time lets bubbles rise and gives you room to adjust the flowers. A 16- to 32-ounce beginner resin kit usually costs $20-$45. Avoid fast-cure formulas for detailed flower placement until you are comfortable working quickly.
Cold resin is thick and holds bubbles. Before measuring, place tightly closed resin and hardener bottles in a warm-water bath for about 10 minutes. The water should feel warm, not hot. Dry the bottles completely so water cannot drip into your mixing cup.
Measure exactly as the manufacturer directs. Stir slowly with a smooth silicone stick, scraping the sides and bottom without whipping the mixture. Fold the resin instead of beating it. When the mixture is uniform, let it rest for two or three minutes so larger bubbles can rise. Do not wait so long that it becomes hot or noticeably thick.
A silicone mixing set costs around $10-$20, and a mini heat gun generally costs $15-$30. You do not need a pressure pot for ordinary jewelry, bookmark, or coaster projects. Careful preparation is enough for most beginner flower pours.
Use a Thin Base Layer and Pre-Coat Each Flower
Pour a shallow clear layer into the mold—just enough to cover the bottom. Guide resin into corners with a silicone tool, then make one brief heat-gun pass several inches above the surface. Keep the tool moving. If your resin instructions prohibit direct flame, do not use a torch.
Next, place a small puddle of mixed resin on a silicone mat or inside a spare mixing cup. Hold the dried flower with fine tweezers and use a soft brush or silicone tool to coat the front, back, edges, and center. This pre-coat replaces the air touching the flower with resin before the flower enters the mold. Pay special attention to overlapping petals and the cut end of a hollow stem.
Do not leave a thick blob of resin on the flower. The goal is a wet, transparent film. If the petals turn translucent evenly, the resin has reached their surfaces. If a silvery patch remains beneath a petal, air is probably still trapped there.
Place Dried Flowers Without Trapping Air
Hold the pre-coated flower at one edge and lower it into the base layer at a slight angle. Let the resin contact the flower gradually from one side to the other. This pushes air ahead of the contact line instead of sealing it beneath the center.
Once the flower is in place, use a toothpick or silicone detail tool to press it gently into the resin. Trace around the outer edge, then lift any overlapping petal just enough for resin to flow underneath. For a dense center, nudge it from two directions and watch for tiny bubbles to escape. Do not mash the flower; gentle movements protect its shape.
Look through the side and bottom of a clear mold if possible. A bubble hidden under a flower often appears silver because it reflects light. Rotate the mold rather than relying on a single overhead view. Pop visible surface bubbles with a toothpick, or bring them to the edge where they can break.
If the flower floats, wait until the base layer becomes slightly tacky before positioning it, or use a tiny drop of mixed resin to anchor it. Our tutorial on Keeping Dried Flowers From Floating in Resin explains that timing in more detail.
Add the Final Resin Layer in Stages
After placement, wait five to ten minutes and inspect the flower again. Air can move slowly out of thick centers. Release any new bubbles, then pour the next layer in a thin stream beside the flower rather than directly onto it. Let the resin rise around the petals naturally.
For deeper molds, follow the resin maker's maximum pour depth and use multiple layers. A single deep pour can heat rapidly and encourage bubbles to expand. Layering also gives you another chance to inspect the piece before the flower disappears under more resin.
Use only short heat passes on the open surface. Keep a heat gun moving and stop as soon as the bubbles break. A toothpick is safer near the flower itself. Check the piece every five to ten minutes during the early working period, but stop touching it once the resin thickens; late adjustments can leave trails and ripples.
Cover the mold with a clean box or curing cover to block dust. Keep it on a level surface at the temperature recommended for your resin, commonly around 70-75°F. Do not move or demold the piece early.
Troubleshoot Bubbles That Keep Appearing
If bubbles repeatedly form beneath petals, the flower probably needs a more complete pre-coat or lighter sealing coats. Remove it while the resin is still workable, wet the underside thoroughly, and place it again at an angle.
If bubbles stream from a stem, the stem may be hollow. Trim it shorter, seal the cut end, or fill the opening with resin before placement. If bubbles emerge from the center of a thick bloom, use individual petals next time or dry the flower longer.
Cloudiness rather than distinct bubbles can point to moisture, an inaccurate mix ratio, cold resin, or vigorous stirring. Stop and identify the cause before adding another layer. A wet or improperly cured flower cannot usually be made clear with heat.
If a bubble is discovered after curing, drill or carve it out only when it is close to the surface, clean away all dust, and fill the cavity with fresh resin. Deep bubbles beneath sentimental flowers are often safer to accept as part of the handmade piece. Trying to reach them can damage the inclusion.
Common Mistakes to Avoid
The biggest mistake is embedding flowers that are not fully dry. Other frequent problems include skipping the underside when sealing, pouring too deeply, dropping a flower flat onto the resin, and applying excessive heat after placement.
Avoid using a torch close to dried botanicals. Flowers can darken, curl, or scorch before the surrounding bubble releases. Do not mix resin rapidly in an effort to save time, and do not scrape foamy residue from the mixing cup into your mold. Finally, resist overworking the piece. Once the resin begins to thicken, repeated poking often introduces more marks than it fixes.
A practice batch with inexpensive flowers is worthwhile before preserving a wedding bloom, memorial flower, or other irreplaceable keepsake. Record the resin brand, room temperature, layer depth, and timing so a successful method is easy to repeat.
Frequently Asked Questions
Do dried flowers always need to be sealed before resin?
Not always, but sealing is strongly recommended for porous or sentimental flowers. A light clear seal reduces air release, protects fragile petals during placement, and may limit color changes. Test the sealer on a spare flower because some products can darken or spot delicate petals.
Why are bubbles forming under my flowers after I walk away?
Air may be escaping slowly from layered petals, a hollow stem, or a dense center. Pre-coat the flower, use a shallow base layer, and inspect the piece several times during the first 20 to 30 minutes. Longer-working resin gives those bubbles more time to rise.
Can I use a heat gun to remove bubbles around dried flowers?
Use a heat gun only for brief passes over surface bubbles. It cannot reliably remove air trapped beneath a flower, and too much heat can damage petals or accelerate curing. A toothpick, resin brush, and angled placement are better for bubbles touching the flower.
Can fresh flowers go directly into epoxy resin?
No. Fresh flowers contain water that can cause discoloration, cloudiness, bubbles, and curing problems. Press or silica-dry them completely before sealing and embedding.
What resin is best for dried flower projects?
A clear, UV-resistant art or casting epoxy with a 30- to 45-minute working time is beginner-friendly. Match the formula to the mold depth, measure exactly, and follow the manufacturer's safety and pour-depth directions.
Clear Flower Resin Starts With Preparation
The most dependable way to master how to prevent bubbles around dried flowers in resin is to control the air before the flower is submerged. Fully dry and lightly seal the bloom, mix warm resin slowly, pre-coat every surface, place the flower at an angle in a thin base layer, and inspect it before completing the pour.
Those steps take a little longer than dropping a flower into a full mold, but they protect the details that make botanical resin special. Practice with simple pressed petals first, keep your heat gentle, and let each layer cure on a level, covered surface. With a patient workflow, your flowers can remain the focus instead of a cluster of bubbles.