Clear Acrylic Sealers and Varnishes for Crafts: Choosing the Right Finish
A clear acrylic sealer preps the surface to paint while a varnish determines the sheen and durability of the finished piece.
For most painted crafts, brush two thin coats of DuraClear Varnish in the sheen you want, anywhere from ultra matte to high gloss. Reach for Triple Thick Gloss Glaze when you want a thick, glassy coat in one pass, or Clear Pouring TopCoat for flat pour art. Multi-Purpose Sealer works differently: it goes on before you paint.
Below: what a clear coat actually does, how the DecoArt sealers compare, the four steps to a clean finish, and how to pick one for the project in front of you.
What a clear coat for acrylic paint actually does
A clear coat for acrylic paint does three jobs at once. It puts a harder film between your paint and the world, so the piece survives being picked up, stacked, wiped down, and knocked about. It slows down moisture. And it sets the sheen, which is the part most people underestimate: the same painting can read as softly matte or bright and saturated depending on nothing but the topcoat.
That last point matters more than durability for a lot of projects. The topcoat is what puts the final look in your hands: the same piece can finish flat and velvety or deep and glassy, and you decide which, right at the end, without touching the colors underneath.
Sealer and varnish are not the same product
This trips up more shoppers than any other part of the category, and it is worth being precise about, because the two products sit next to each other on the shelf.
- A sealer goes on the bare surface before you paint. It stops raw wood from drinking up your first coat and gives slick surfaces something to grip.
- A varnish or topcoat goes on after the paint has dried. This is the protective clear coat most people are actually shopping for.
DecoArt's Multi-Purpose Sealer is the first kind. If you brush it over a finished piece expecting a protective topcoat, you have used the wrong bottle. Its own directions are explicit that it seals raw wood and slick surfaces to improve paint adhesion.
Multi-Purpose Sealer
Use this one first, on raw wood, glazed ceramic, glass, or scuffed metal. The directions allow thinning with water on more absorbent surfaces, and you can mix it 1:1 with your paint to basecoat and seal in a single step. For outdoor surfaces, DecoArt directs you to mix it into the paint so that no varnishing is necessary.
Shop Multi-Purpose Sealer →Compare DecoArt clear sealers and varnishes
Four products cover almost every craft finishing job. The differences come down to how thick the coat is, how it goes on, and what sheen you end up with.
Tap any bottle to open its product page.
How the four compare
Every cell below is taken from the current DecoArt product directions.
| Product | Best for | Finish | How it goes on | Interior and exterior | Worth knowing |
|---|---|---|---|---|---|
| DuraClear Varnishes | Everyday protection on painted wood, metal and home decor | Six sheens, soft touch through high gloss | Brushed in thin coats | Yes | Non-yellowing polyurethane, flexible when dry |
| Triple Thick Gloss Glaze | A thick, glassy, dimensional coat in a single pass | High gloss | Brushed, one coat | Yes | Not recommended for canvas because of the weight |
| Clear Pouring TopCoat | Flat pour art on canvas and wood panels | Lacquer-like high gloss | Poured, then self-levels | Not specified by DecoArt | One-step formula with no chemicals to mix |
| Multi-Purpose Sealer | Prepping raw wood, glass, glazed ceramic or slick metal | Clear, slightly gloss | Brushed before painting | Yes | Goes on before the paint, not after |
Scroll the table sideways on a phone to see every column.
The same three paint colors under all six DuraClear finishes. Reading left to right, soft touch and ultra matte kill almost all reflection, matte and satin sit in the middle, and gloss and high gloss deepen the color noticeably. Nothing about the paint changed between those swatches. Only the topcoat did.
If you cannot decide, satin is the safest default. It hides brush marks and surface flaws better than gloss, and it looks less dusty than a full matte under warm indoor light.
How to seal acrylic paint in four steps
The technique matters as much as the product. Nearly every bad varnish job comes from rushing one of these four steps.
- A finished piece that has cured, not just dried to the touch.
- A large, flat brush, which is what the DuraClear directions call for. A soft synthetic works well.
- Your varnish, shaken well before you open it.
- A lint-free cloth for dusting the surface first.
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Let the paint cure, not just dry
Acrylic paint feels dry long before the film has hardened. Sealing over paint that is still curing is the usual cause of hazing and cloudiness. Triple Thick's directions say it plainly: make sure the project is dry and cured completely before coating, to avoid hazing or blurring.
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Dust the surface and check your conditions
Wipe the piece with a lint-free cloth. Anything sitting on the paint gets locked under the clear coat permanently. Triple Thick asks for temperatures above 60°F and humidity between 50 and 70 percent, which is a reasonable target for any water-based topcoat.
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Brush on one thin coat and leave it alone
Shake the bottle, load the brush lightly, and work in one direction across the piece. The coat will look milky. Resist the urge to go back and rework a spot that looks thin, because brushing into a coat that has started to set is what leaves streaks and drag marks. Let it dry and fix it on the next coat.
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Add a second coat, then let it cure
Two thin coats beat one thick coat every time, on coverage and on clarity. Then give it time before the piece goes into use. Triple Thick needs 24 hours to cure for durability, and anything headed outdoors deserves at least that long.
Do you need an acrylic sealer spray?
Usually not, and DecoArt's clear finishes in this range are brush-on rather than aerosol. For most craft projects that is an advantage rather than a limitation.
An acrylic sealer spray is genuinely useful in two situations: very delicate surfaces where a brush would drag pigment, and deeply textured pieces where bristles cannot reach into recesses. Outside those cases, a brush gives you more control over film thickness, wastes less product, does not drift onto everything else on the table, and lets you actually see your coverage while the coat is still milky.
For a textured piece, the brush-on answer is a soft, well-loaded brush and a lighter touch, working the varnish into the recesses before you smooth the raised areas. On a very delicate surface such as chalk or soft pastel over acrylic, test on a scrap first, whichever product you choose.
Choosing a craft sealer by project
The right craft sealer depends less on the paint you used and more on where the finished piece ends up living.
01Painted rocks and garden pieces
Triple Thick builds the deep gloss you can see along this rock's top edge, and it is weather resistant once cured. More on the painting side in our rock painting ideas guide.
02Pour art on panels
Clear Pouring TopCoat is poured rather than brushed and self-levels into an even sheet. If you mixed the pour itself with DecoArt Pouring Medium, this is the finish built to go over it. Work above a covered surface, because the excess runs off the edges exactly like this.
03Jewelry and small handled pieces
Anything worn or handled daily wants the hardest film you can give it. The domed shine on these pendants is Triple Thick, which suits small pieces where a heavier coat costs you nothing.
04Canvas art
Use a brushed DuraClear Varnish here. Triple Thick is not recommended for canvas because the coat is heavy enough to pull at a stretched surface.
Decorative paper and marbled surfaces seal well with a brushed varnish. Note the paper plate: pouring a small puddle and loading from that keeps you from contaminating the bottle, and it makes it much easier to judge how much varnish is on the brush.
One more option is worth knowing about if your project involves paper. Americana Decou-Page acts as glue, sealer and finish in a single bottle, which saves a step on decoupage work. It comes in matte, satin and gloss, and DecoArt describes the matte as a zero-glare protective finish, the satin as a subtle sheen, and the gloss as the best protection against stains and smudges. There are also specialty formulas for fabric, napkins, photo transfer, and outdoor use.
DuraClear Varnishes
Brush-on, non-yellowing polyurethane varnishes that form a tough, flexible clear finish and dry quickly. They work on most hard craft surfaces, indoors and out. Matte, ultra matte, satin, gloss and high gloss come in 2 oz. and 8 oz. Soft touch is 2 oz. only. Shake well, then apply with a large, flat brush.
Shop DuraClear Varnishes →
Triple Thick Gloss Glaze
A water-based, non-toxic glaze that delivers a diamond clear finish in one coat. It suits rocks, wood, paper mache, resin, MDF and polymer clay, and it is weather resistant, water repellent and heat resistant once cured. It will not crack or yellow. It is not recommended for canvas, and it is not intended for direct food contact.
Shop Triple Thick Gloss Glaze →
Clear Pouring TopCoat
A high-gloss clear acrylic made for finishing pour art. The one-step formula removes the need to mix harsh chemicals, and it flows into a self-leveling, crystal clear coat that will not yellow, so the artwork keeps its original vibrancy. Built for canvases, wood panels and other flat art surfaces.
Shop Clear Pouring TopCoat →Common questions
Do I have to seal acrylic paint?
Not always. A piece that sits on a shelf indoors and never gets handled will be fine unsealed. Seal anything that gets touched, wiped, worn, or put outside, and seal anything where you want to choose the finish yourself, since the topcoat is what decides whether the piece reads matte or glossy.
Why did my clear coat dry cloudy?
The most common cause is sealing over paint that had not fully cured. Triple Thick's directions warn about exactly this, and ask that the project be dry and cured completely before coating to avoid hazing or blurring. Cold or damp conditions and coats applied too thickly will do it too.
Can I put a matte varnish over a gloss one?
Yes. The last coat sets the sheen, so a matte or ultra matte DuraClear over a glossier coat will knock the shine down. Let the first coat dry fully first, and expect a slight softening of color depth, since the flatter finish scatters more light.
Which sealer works outdoors?
DuraClear Varnishes are rated for both interior and exterior use, and Triple Thick is weather resistant and water repellent once cured. For outdoor projects you are painting from scratch, DecoArt also directs you to mix Multi-Purpose Sealer into the paint itself, so that no varnishing is necessary afterwards.
Ready to finish the piece properly?
Pick your sheen first, then brush two thin coats and give it a day before it goes into use.