Fish Eyes in Finish issue with Epoxy Floor Coating - Problem Solving Guide

Fish Eyes in Finish issue with Epoxy Floor Coating - Problem Solving Guide

Posted by Bryon Hendricks on Apr 21st 2019

Problem: Fish Eyes in the epoxy coating finish

Have you had you seen issues in the epoxy coating finish that look like round indentions? We are going to explain what can cause this issue, so you can avoid it in the future, and what can be done to repair it.

Description: Fish Eyes

Fish eyes are round separations or indentions in the coating finish. They look like water and oil separate.

What can cause Color Differential when applying epoxy floor coating to concrete floors:

  • Oil/Grease Contaminants: This can cause the epoxy to work improperly and cause fish eyes to appear.
  • Silicone: Contamination from silicone can also cause fish eyes to appear.

How to repair Fish Eyes:

  • Oil/Grease: First start by degreasing the floor by solvent cleaning or using a degreasing detergent. This will prevent spreading of oils and greases from the sanding process. 
  • Oil/Grease: Second, sand, screen, grind the surface to prepare it for another coating. Re-install the finish coat to a newly degreased, sanded, and clean floor.

Prevention:

  • Degrease entire surface before any grinding or sanding. 
  • If oils and grease cannot be removed entirely, use a suitable oil-stop primer. 
  • In between coats clean with solvents before applying succeeding coats.