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Sand the bubbles using medium-grit sandpaper and a rotary scrubber. Use a sand blaster if you have bubbles in the entirety of your floor. Vacuum the dust and wipe your floor with clean cloth dipped in solvent. Apply another coating of epoxy.

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For small groups of bubbles, you can use a palm sander and 60-grit sandpaper. For larger bubble clusters, it may be easier to use a floor buffer. Locate the area of your floor with bubbles, and place the sander over top for 5-15 seconds. Move on to the next area until all bubbles are sanded. Palm sanders cost $14 a day (9.94) or $56 (39.76) a week to rent. You can rent a floor buffer for about $33 a day (23.43) or $120 a week (85.19). Sanding over your floor scratches up the bubbles, making it easy to apply a fresh coat of epoxy. You can rent a sand blaster to remove all of the epoxy coating. Connect your sand blaster to the air compressor and your watering hose. Turn it on and select the medium or hard blasting option. Then, start at the edge of your floor, and pull the trigger to release the sand. Walk your blaster in a straight line across your floor, and continue until all of your epoxy is removed. The sand blaster shoots finely ground silica at your floor very quickly, and this removes any unwanted substance from your floor. You will need to rent an air compressor as well as the blaster and purchase sand to use. In total, this will cost about $100 (70.96 for the day). Make sure your sand blaster is full of silica, and fill up the holding tank if needed. Using a shop vac, go around your floor and get rid of all dust and debris so it doesn't get trapped in your epoxy. After you vacuum up as much dust as possible, pour some solvent onto a clean rag, and wipe the entirety of your sanded floor. Solvents help the epoxy adhere to your floor evenly, which prevents bubbles from emerging. Solvents come in many varieties, but for great results you can use a heavy-duty degreaser specifically for epoxy. It costs about $10 (7.10) at most home supply stores. Once you sand away all the bubbles and clean up any dust, you can easily recoat your epoxy. Touch up small repair areas, or recoat your entire floor, depending on how much of your floor had bubbles. Use a 34in (1.9cm) wide roller, and pour your well-mixed epoxy into a paint tray. Spread the epoxy over your floor starting in the back and working your way towards the front. Apply your epoxy in thin, even layers for best results. If you want to apply additional coats, wait 24 hours for your epoxy to dry.