How to seal garage floor cracks ?

[UCUDANT]

I need to know how to seal the cracks in my garage floor prior to eurothaning it. I was told if the cracks are 1/8th or smaller not to worry. Do I need to bevel out the cracks with a grinder? What should I use to seal it and how long should it cure before I acid etch? Thanks

 

[krooser]

Use a readily available epoxy crack filler AFTER you etch..use a wide putty knife..no need to do any other prep...wait about 48 hours OR per directions with the product.

 

[UCUDANT]

Is Epoxy crack sealer compatable with eurothane coating? How large do cracks need to be to require attention/ or not before the top coat

 

[krooser]

Generally speaking, you need a filler that will not be attacked, or degraded, by the floor coating.

Epoxy will stand up to urethane coatings just fine.

I didn't fill any cracks in my floor before I coated it.

#1, I didn't fill the small cracks because my shop is a "working" shop with lots of welding, cutting, machining and heavy stuff being wheeled across the floor...some damage to the surface is inevitable. My shop is not a show piece.

#2 The few small cracks that are present were pretty much filled by the epoxy floor coating. You can still see them if you look closely but I have a lot of equipment that covers a large percentage of the floor and they are pretty much covered.

 

[Luckydevil]

Pretty much every crack that I left unfilled in my floor showed through the epoxy. I used a filler from home depot on the larger cracks and it worked great. Still holding up fine a year later and no problems with the epoxy adhering to it.

You can see the stuff I used in this thread... http://www.garagejunkies.net/showthread.php?t=1614&highlight=cracks

 

[UCUDANT]

Cool thanks, any recommendations for acid etching. I read a 1/3 phosphoric acid solution works?

 

[krooser]

Either phosphoric or muriatic acid will work. Some recommend 3 to 1 ratio...some 4 to 1...I used phosphoric acid ( my helper bought it and did the etching)...My wife used muriatic acid on our patio before she stained the concrete...both worked fine.

 

[UCUDANT]

I think I will look for the crack sealer tomorrow and get started. Then on to acid prep and eurothane. Hopefully it stays warm enough here (Albuquereque New Mexico)

 

[krooser]

I'd etch BEFORE you patch to be on the safe side...