Water bearing up

[Dizzyj]

That’s beading up

Preparing my floor for polyurea coating. It’s a large 1400 sqft garage. There are several spots where the water beads up even after etching and degreaser. I bought some oil stop primer, but I did not have enough to hit all the spots. The spots are hard to see. They are not obvious oil stains. I have to wet the floor to see where the water beads. I ordered more primer, enough to just do the whole floor, but now I’m reading that there is a 24 hour record time. I’m assuming that’s the time to also put the polyurea down?

Not sure what to do at this point. Going to try degreaser and scrub again. But looking for advice.

 

[Shea]

Would these spots be in areas where car tires were parked? If so, it may be silicone from tire dressing. If that's the case, you won't get that up with chemicals/scrubbing and need to remove it via grinding. Sometimes even that is not enough and it will require the oil stop primer.

Don't stress over the primer going past the recoat window. You can rough it up with 120 grit sandpaper and then give it a wipe of denatured alcohol on a microfiber pad when you are ready to apply the polyurea. Just focus on getting all of the affected areas taken care of first. The prep for the polyurea is the most important process of the entire project.

 

[Dizzyj]

Would these spots be in areas where car tires were parked? If so, it may be silicone from tire dressing. If that's the case, you won't get that up with chemicals/scrubbing and need to remove it via grinding. Sometimes even that is not enough and it will require the oil stop primer.

Don't stress over the primer going past the recoat window. You can rough it up with 120 grit sandpaper and then give it a wipe of denatured alcohol on a microfiber pad when you are ready to apply the polyurea. Just focus on getting all of the affected areas taken care of first. The prep for the polyurea is the most important process of the entire project.

Thanks. I guess I’ll just plan to do the whole floor in primer. Would rather a bit of overkill but make sure it’s done right

 

[Antoddio]

Thanks. I guess I’ll just plan to do the whole floor in primer. Would rather a bit of overkill but make sure it’s done right

Not using the oil stop primer isn’t going to be your issue. Not grinding will be your issue. Dousing your floor with water so many times may cause it’s own problems too. Unfortunately, it sounds like right now there is a low probability for success.


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[Dizzyj]

Not using the oil stop primer isn’t going to be your issue. Not grinding will be your issue. Dousing your floor with water so many times may cause it’s own problems too. Unfortunately, it sounds like right now there is a low probability for success.


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I take it you would recommend grinding then not using primer?

 

[Billwater24]

It’s not a pretty answer, but grinding those spots is the most assured way to get the epoxy to stick. Anything else and it may or may not stick.

 

[Antoddio]

I take it you would recommend grinding then not using primer?

Grind and then also prime is typically the way to do it.


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[LegacyIndustrial]

Oil Stop primers, in general, are designed for Motor Oil.
Silicones, animal fats, etc... will not work with this product.

Grind those areas still beading.

 

[Dizzyj]

Ok concrete grinded. Full order of primer and since I needed to prime I decided to go with ultra armor vs the spgx polyurea