Blisters in topcoat - solutions?

[todd_fuller]

So I'm looking for knowledgable opinions on how to resolve the issue of many, many blisters (for lack of a better term) in a polyurea top coat. The coating also contains areas with LOTS of trapped bubbles.

The floor was diamabrushed, primered, epoxy base + full broadcast chip then polyurea top coat. 1 day of waiting between coats for 4 working days to complete.

The floor is for a residential 3-car garage, ~550sq. ft, expecting to jack cars up on, etc.

Thanks for the input, pictures below.

Typical blister. You can scrape off the top to reveal the chips beneath.

Encapsulated bubbles, usually areas 2-3 sq. ft.

Blisters marked with painter's tape.

 

[jonjon1]

I had an office floor done in a building I was flipping, there was some bubbles for what ever reason, the guys seemed to just wet sand it with a block and squirt gun... I htink it was 2000 grit and they waited a few days to do it..

 

[SunsetsAndFriends]

Scotty from Legacy Industrial sells a polyurea. He might have some ideas.

 

[LegacyIndustrial]

What can cause them? Trapped air from too much mixing, slightly uncured base coat still curing and out-gassing, rolled out a little on the thick side, direct sunlight when curing.

These are the most common issues.

Sand/grind out that little bit and patch it in. Should be easy enough with a full flake.

 

[todd_fuller]

So an update... contractor came out and indicated their plan is to squirt some xylene on the blisters and allow them to self-level. I wasn't there to see what the root cause was, but I believe it was too thick. Temps were cool, garage is north-facing so no sunlight but it was very humid.

This kind of thing makes me feel like I should have just DIY'd it.

 

[benwah]

What product did he use? What was the temp? Humidity could have very well been the culprit, along with DFT exceeding manufacturer's recommendations, if that is the case.

 

[Armorpoxy]

If it was put down too thick, this can happen. Often people think that thicker is better, but it's not for most products. Agree with this thread could also be moisture or air mixed in.