Using resin as a top coat involves preparing the surface, mixing the resin correctly, and carefully applying it to achieve a durable, high-gloss finish.
Resin is a popular choice for top coats on various projects, from art and coasters to countertops and woodworking, due to its protective qualities and ability to create a beautiful, clear, and often glossy layer. Applying it correctly is key to avoiding common issues like bubbles, uneven surfaces, or poor adhesion.
Why Use Resin as a Top Coat?
Applying a resin top coat provides several benefits:
- Protection: Shields the underlying surface from scratches, UV damage, and moisture.
- Durability: Creates a hard-wearing surface.
- Aesthetics: Enhances colors, adds depth, and provides a professional, glossy finish.
- Self-Leveling: Many resins are formulated to naturally spread and level out into an even layer.
How to Apply Resin as a Top Coat
Applying a resin top coat requires careful preparation and execution. One crucial step, especially if applying over a previously cured resin layer, is preparing the surface.
Preparing the Surface
This is a vital step to ensure proper adhesion and a smooth finish.
- Cleanliness: Ensure the surface is completely free of dust, dirt, grease, or debris. Wipe it down with isopropyl alcohol or a tack cloth.
- Leveling: The project surface must be perfectly level before pouring the resin. Use a spirit level to check.
- Sanding (Crucial Step for Cured Surfaces): In order to topcoat your work you will first need to sand your project down, if your work has fully cured then another layer of epoxy resin won't bind to the cured layer below, gently sanding the layer down first, then cleaning any sanding debris, will enable you to pour another layer on top and will then self level. This means if the previous layer of resin (or paint, wood stain, etc.) is fully cured and hard, you must lightly sand the surface. Use fine-grit sandpaper (e.g., 220-grit or higher) to create a mechanical bond for the new resin layer. After sanding, meticulously clean off all sanding dust.
- Sealing (for porous surfaces): If applying to wood or other porous materials, you may need a thin seal coat of resin or another sealant first to prevent air bubbles from escaping into the top coat.
Mixing the Resin
Resin typically comes in two parts: the resin and the hardener.
- Measure Accurately: Follow the manufacturer's instructions precisely for the correct ratio by volume or weight.
- Mix Thoroughly: Scrape the sides and bottom of the mixing container. Mix slowly for the recommended time (usually 3-5 minutes) to avoid introducing excessive bubbles.
Applying the Resin
Pour the mixed resin onto the center of your prepared surface.
- Pour: Allow the resin to spread naturally. You can gently guide it to the edges using a spatula or spreading tool.
- Cover: Ensure the entire surface is covered evenly.
- Remove Bubbles: Use a heat gun or propane torch (kept moving quickly several inches above the surface) to pop surface bubbles. A breath can also work for small areas (contains CO2).
- Cover: Cover the project while it cures to protect it from dust and debris.
Curing
Allow the resin to cure fully in a dust-free environment according to the manufacturer's instructions. This typically takes 24-72 hours depending on the specific resin, temperature, and humidity.
Tips for a Perfect Finish
- Work in a clean, warm environment: Dust and low temperatures can cause issues.
- Wear appropriate PPE: Gloves, eye protection, and potentially a respirator.
- Use a good quality resin: Different resins have different properties (e.g., viscosity, UV resistance).
- Calculate the required amount: Avoid mixing too much or too little. Online calculators can help.
Quick Steps Summary
| Step | Action | Key Detail |
|---|---|---|
| 1. Preparation | Clean, level, sand (if cured), clean again, seal (if needed). | Sand cured surfaces first for adhesion. Remove all dust. |
| 2. Mixing | Accurately measure and slowly mix resin and hardener. | Follow ratio precisely. Mix thoroughly, scraping sides. |
| 3. Application | Pour resin, spread evenly, remove bubbles. | Use a heat gun or torch carefully to pop bubbles. |
| 4. Curing | Let project cure undisturbed in a dust-free area. | Follow manufacturer's cure time. Protect from dust. |
By following these steps, including the essential sanding of fully cured layers as highlighted in the reference, you can successfully use resin to create a beautiful and protective top coat.
