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I used to get bubbles in every epoxy floor I did. I learned a trick that got rid of them forever. I do about 20 to 25 epoxy floors a year. High end clients.

2 COATS

Coat one:
- Mix no more than 1 liter at a time
- Mix with stir stick
- Never mix epoxy with a drill
- Cut back with a splash of xylene or ISA99% (Isapropyl alcohol) (dont worry just splash it in. 5% of volume of sealer if you want to measure)
- Dump out on floor.
- Trowel the epoxy down with a drywall blade (blue steel blade) http://images.orgill.com/200x200/4813341.jpg
- Go slowly, make sure if the floor is sucking the epoxy up that you back trowel until there are no dry spots. You are TIGHTLY troweling. You are going for a coverage rate of aprox 500 to 800 sq ft per gallon.
- (I know a lot of you are going to hear from your suppliers that this is the wrong way to do it or that's too thin or never reduce epoxy etc... Believe what you want this works amazing for me and it's not too thin because you are coating with squeegee and back rolling the next day. Make sure you get back on it as soon as possible before your 24 hours is up. I blade coat in afternoon and go back next morning to be sure.)

IMPORTANT: The only way you can screw this  up is by not troweling it flat and leaving ridges (can always be sanded out if happens.) or by leaving dry spots.

Notes: You'll usually find that at the end of each troweling batch you have a pile of garbage that you've brought along with you, this would have been left in your floor if you had been doing one thick coat.

The reason this works so well is because your first coat is thin enoough to pop when air/vapor is going through it from the slab so no bubbles. Once it cures the slab is no longer breathing so you can then roll out your nice thick finish coat for a glass smooth floor. 220 Screening and waxing when done is the ultimate finish.

I tend to have about 20 to 25 minutes of open time with each small batch I make.

Don't worry about your trowel pattern showing through the next day after top coat. (for clear coats). It won't as long as you evenly wet out the floor on your blade coat.

Hope this helps!

JM