Should you Skim or Seal Coat Before You Apply Epoxy?

Should you Skim or Seal Coat Before You Apply Epoxy?

Published by Jo Seanor on Jul 29th 2021

To Skim, or not to Skim

Often people ask if they need to apply a skim coat to their project. Even more so, people ask, “What is a skim coat?” We will quickly explain what a skim coat is, when it is necessary, and how to apply it to your project!

What is a skim coat? A skim coat is an extremely thin, colorless layer of epoxy with the goal of being absorbed into the substrate to seal it. The epoxy will fill micro-voids while easily allowing any air pockets to escape. This is very important as we don't want bubbles from the substrate appearing and struggling to rise through a thick flood coat.

When do I apply a skim coat? Substrates such as MDF and Laminate are not considered porous and can handle a Flood coat from the get go. However, any time you are working with a porous substrate such as untreated wood or concrete - always skim. Some substrates are very porous and may require several skim coats. Stone countertops such as quartz, marble, or granite, may hardly appear porous at all, but may need a skim coat. You can always conduct a water test to see how absorbent the substrate is and make your best judgment from there. Air on the side of caution and apply a skim coat if you're not sure. Better to be safe than sorry! *Although tile is not considered porous, the grout lines are. Please view our video: 

 to get more information on how to tackle such a project.

How do I apply a skim Coat?

When working on a countertop or bartop, you will want to use about 2-3 ounces of mixed epoxy per square foot. Use a firm squeegee to slowly pull the epoxy from one end to the other. Don't overwork the product, especially if the countertop has any texture as it can become foamy. You can use a paint brush in those nooks and crannies if needed. Remember, it is not uncommon for people to apply a second skim coat when working with very porous materials. Do not torch, do not apply alcohol. Simply give it 6-12 hours to cure, and from there, directly apply your epoxy Flood coat ontop.

What about for a floor?For our Diamond Gloss Flooring and Flex Epoxy, you will want to utilize about 1 ounce of mixed colorless epoxy per square foot. We recommend using a t-bar and foam t-bar cover for application. Do not apply alcohol, simply allow it to cure within 12-24 hours. From there, you are good to apply your flood coat.

We have instructions on our website along with our YouTube channel that showcases plenty of tutorials. If a further explanation is needed or you have a very specific project you would like to discuss, feel free to contact our experienced Customer Service staff 970-639-9338