7 Best Top Coat Sealers For Long Lasting Shine

Handmade buttons are the jewelry of the knitting world, providing the final flourish on a complex cardigan or a cherished accessory. When these buttons are crafted from polymer clay, however, they require a protective seal to prevent wear from friction against yarn or repeated laundering. Choosing the wrong finish can result in a tacky surface that attracts lint or a dull look that detracts from the vibrancy of hand-mixed colors. Selecting a top-tier sealer ensures these small, functional art pieces remain as crisp and polished as the stitches themselves.

Sculpey Gloss Glaze: Best for Polymer Clay Buttons

Sculpey Gloss Glaze is formulated specifically for the chemical composition of polymer clay, ensuring perfect adhesion. It provides a flexible, slightly soft finish that won’t crack even if a button undergoes slight tension when threaded onto a heavy wool garment.

Because it is water-based, cleanup is simple, though it requires multiple thin coats to achieve a high shine. Avoid the temptation to slather on a single thick layer, as this will lead to visible brush strokes that interrupt the clean lines of a custom-shaped button.

This glaze is the safest bet for beginners who want a reliable, non-toxic finish that mimics the look of fired ceramic. It is ideal for buttons that will see moderate use, provided they are allowed to cure fully before being sewn onto a sweater.

Varathane Water-Based Poly: The Crafter’s Secret

Varathane is a heavy-duty polyurethane that offers a level of toughness far exceeding traditional craft glazes. It is the preferred choice for knitters creating decorative toggles or heavy-duty closures that will be handled frequently.

The finish is exceptionally clear and non-yellowing, making it suitable for light-colored or white clay projects. It dries to a harder, more resistant surface than most craft-specific varnishes, providing a protective shell that stands up to the abrasion of rough wool or mohair textures.

Use a high-quality synthetic brush to apply this, as cheap bristles will shed and mar the smooth surface. It is a professional-grade solution that transforms home-baked clay into a finish that looks indistinguishable from commercial hardware.

Liquitex High Gloss Varnish: For Pro-Level Shine

Liquitex is a staple in the fine arts world, prized for its extreme clarity and archival quality. When applied to polymer clay, it creates a glass-like sheen that brings out the depth of mica powders or intricate color blends.

This varnish is self-leveling, meaning it smooths out minor imperfections left by brush application. It is particularly effective for large, statement buttons where any streakiness would be immediately apparent against the backdrop of fine stockinette stitch.

Keep in mind that this product is meant for artistic surfaces rather than heavy mechanical wear. Reserve it for delicate accessories or decorative items that won’t be subjected to the daily friction of a buttonhole.

Mod Podge Dishwasher Safe: Ultimate Durability

For projects that require frequent washing—like a toddler’s cardigan or a frequently used market bag—Mod Podge Dishwasher Safe is the standard. It creates a durable, water-resistant seal that prevents moisture from compromising the clay’s integrity.

• Long-term protection: Resistant to the heat and detergent cycles of a dishwasher, which translates to a long life in the washing machine.
• Application tip: Apply a thin layer, allow it to dry completely for at least an hour, and repeat three times for best results.
• The trade-off: The finish is slightly thicker than specialized glazes, so apply it sparingly to avoid hiding fine details or textures.

This is the most practical choice for functional knitting projects where longevity is the primary concern. Always prioritize the curing time listed on the bottle, as rushing the process will lead to a soft, cloudy finish.

Let’s Resin UV Resin: For a Quick, Glass-Like Finish

UV resin is a game-changer for those who need a professional, rock-hard finish in a matter of minutes. Under a UV lamp, it cures instantly, creating a thick, protective layer that is both scratch-resistant and incredibly glossy.

This method is superior for creating a “domed” effect on flat buttons or brooches. It provides a level of depth that no brush-on liquid sealer can replicate, effectively magnifying the colors beneath the surface.

• Speed: Near-instant curing eliminates the risk of dust settling into wet sealer.
• Thickness: The viscosity allows for a perfectly smooth top surface.
• Caution: Requires careful, bubble-free application and a UV light source to function correctly.

It is an investment in equipment, but the result is a professional-grade finish that elevates handmade work to a commercial standard. It is perfect for artisans who produce large batches of buttons.

Fimo Gloss Varnish: Made for Fimo and Cernit Clay

Fimo Gloss Varnish is engineered to bond specifically with oven-cure clays, ensuring no peeling occurs over time. It is a thinner, more fluid medium that settles into textured surfaces without filling in delicate details.

It provides a very clean, professional gloss that doesn’t feel “plastic” to the touch. This makes it an excellent choice for buttons that sit against the skin, as it retains a more natural, comfortable feel compared to thicker resin coats.

If you use various brands of clay, this is a versatile “middle-of-the-road” option. It behaves reliably across different types and is the least likely to cause a reaction or discoloration when used on older or cured clay.

Plaid FolkArt Varnish: Best Budget-Friendly Pick

FolkArt Varnish offers a consistent, reliable finish at a price point that makes it ideal for crafters making large quantities of buttons. It is a straightforward, water-based sealer that provides a soft gloss without the need for expensive tools.

While it lacks the extreme hardness of polyurethane or the depth of resin, it provides a functional barrier against skin oils and environmental moisture. It is a smart choice for makers who want to protect their work without over-engineering the process.

• Application: Works well with a sponge brush for a smooth, streak-free look.
• Versatility: Dries clear and works well over acrylic paint if buttons are customized.
• Maintenance: Easy to re-apply if a button loses its sheen after several years of use.

How to Pick the Right Sealer for Your Project

The right choice comes down to the intended use of the finished garment. If a button will be hidden under a flap or used primarily for decoration, a lighter glaze like Sculpey or Fimo is sufficient. However, if the button will face daily mechanical stress from a buttonhole, turn to a harder sealer like Varathane or UV resin.

Always consider the fiber content of your project. Natural fibers like wool and alpaca can be quite abrasive over time; pair them with a harder finish. If the buttons are meant for delicate lace or lightweight linen, a thinner, more flexible glaze will keep the drape of the fabric intact without adding unnecessary weight.

Tips for a Bubble-Free, Non-Sticky Finish

Bubbles are the enemy of a clean, professional finish. To avoid them, never shake the bottle before use; instead, stir it slowly with a toothpick or a flat wooden stick. If bubbles appear on the surface during application, pop them immediately with the tip of a needle before the sealer begins to set.

Tackiness is almost always a result of high humidity or insufficient curing time. Ensure your workspace is dry, and if the environment is humid, extend your drying time by at least 50% beyond the manufacturer’s suggestion. Never stack your buttons or place them on a towel until they are 100% dry to the touch, as fibers will easily stick to a partially cured surface.

Sealer Safety: Ventilation, Curing, and More

Working with sealers and resins requires a responsible approach to studio safety. Always work in a well-ventilated space, preferably near an open window or with a fan pulling air away from your workspace. Even “non-toxic” formulas can release fumes that are irritating to the lungs during the curing process.

Store all your sealers in a cool, dark place, and ensure the lids are wiped clean of residue to prevent them from sealing shut. Proper maintenance of your supplies ensures that you won’t have to troubleshoot dried-out, clumpy varnish in the middle of a project. Treat your finishing supplies with the same care you afford your best knitting needles, and your accessories will reward you with years of beautiful service.

Selecting the perfect sealer is the final act of craft that preserves the integrity of your handmade hardware. By matching the durability of the finish to the demands of the garment, you ensure that your projects remain as polished as the day they were finished.