I can bet you have seen quite a number of epoxy flooring with bubbles on them. Bubbles are usually observed to be the size of a pinhead or more than an inch in diameter. You can find them in groups or scaterred around the floor. A phenomenon calle “out gassin” is what causes this. And it happens when the epoxy begins to dry up. Because the temperature rises, air is hotter and it expands into a bubble under the epoxy coating.
Application primer should be used to reduce the chance of bubble appearance. Make sure that you do not apply epoxy coating where there is direct sunlight and it would be good to use a drill with slower speed to mix the coating.
Use medium roller if you already decided to use one. The epoxy should be applied very slowly in a gentle motion. It is another thing that can help with bubbles that can appear on our garage floor.
All those bubbles that are formed on the coating are removable with some sandpaper or a rotary scrubber. Use some sandpaper to roughen the bubbled area as a first step. Then scrupulously clean the dust. Then with a rag wipe the surface area with a strong solvent. Apply another coating of epoxy when you are finished with this. Another type of bubble observed is fisheyes. They are usually caused by residual silicon on the surface.
Use sandpaper of medium grit to clean this area in entirety. After this, scrupulously clean the area with a rag dipped in solvent. After this a fresh coating may be applied.
Consider shot blasting or sand blasting the entire epoxy coating in case the bubbles are spread all over that floor. Use sand blaster to remove the epoxy coat from the area you are working on. Afterwards clean the problem area with acid. You can isolate the entire area, in case it is rather small. You will need to repair the area first and the you will have to make a new coating.
The moisture is one more reason why bubbles appear in our epoxy garage floors. To verify this break one of the blisters thus formed and see if there is any moisture inside.
