How To Avoid Dimples:
Dimples can occur for 3 reasons: temperature fluctuation, micro dust particles and overtorching.
To avoid getting dimples in your cured resin, make sure that the temperature in your resin room stays stable, that you use a dustcover and that you only lightly torch your resin!
Let's take a deeper look at the three main causes of resin dimples:
Dimples can occur when the resin cures in cooler temperatures, or if there is a temperature dip in the first 24 hours of a cure. Always aim for a stable room temperature of between 75-85F or 24-30C curing your artwork.
Dimples can also result from surface contaminants
(such as dust particles) landing in your wet resin. Ensure your resin room is as free of dust as possible and always use a dustcover to protect your work while it cures.
Dimples can also result from overtorching. Make sure you only lightly pass the torch two or three times over the resined surface, always keeping it moving, and don't hold it too closely or in one place for too long.
How To Avoid Fish Eyes, Pin Holes and Separations:
It all comes down to proper preparation for a nice smooth epoxy seal coat. Top 5 tips to eliminating epoxy fish eyes, pin holes and separations:
1. Do your epoxy work in a clean, well ventilated environment with minimal air flow that may introduce contaminants to your work area.
2. Wipe the substrate with Denatured Alcohol (DNA) on a lint free rag to pick up most of the contaminants and oils that may be on your work piece. Let the denatured alcohol evaporate completely before applying an epoxy seal coat.
3. Wipe the work piece with an epoxy seal coat prep cloth. This will pick up any additional dirt or debris to leave a clean surface to apply the epoxy coat to.
4. Use a clean bristle brush, foam or nap roller, or squeegee to apply your epoxy coating.
5. Have the work piece the same temperature as the epoxy resin to avoid thermal shock and the resin quickly shrinking and orange peeling. If hot resin hits a cold substrate the rapid change in temperature will cause the resin to ripple and stop flowing correctly.
After preparing applying your epoxy seal coat it is important to avoid introducing contaminants into the "green" first stage epoxy cure.
1. Do not touch the wet epoxy seal coat - Walk away from it and come back about 10 minutes later to assess any inconsistencies in the coating. Even walking around the work piece may kick up dust and debris that will settle into your epoxy seal coat and cause a pin hole or fish eye. Just let the resin flow and flatten out for a while.
2. Come back to the fresh seal coat and assess if there are any small issues. Even with proper preparation and cleaning, fish eyes may occur due to environmental problems out of your control. If there are any issues in your epoxy seal coat simply drip some resin that is still remaining in your mixing bucket on the affected area and let the resin flatten out by itself and bond to the surrounding resin molecules.
3. Do not brush over inconsistent epoxy seal coat areas, that will most likely reduce the surface tension and result in a larger fish eye or separation. A drip of extra epoxy is all you need on the area to solve the issue.
In summary, proper epoxy resin seal coats are subject to your work space environment and your preparation efforts. Following the guidelines written above will greatly enhance the flatness, gloss, and uniformity of your epoxy coating.