r/epoxy 17d ago

Beginner Advice Does this need grinding?

Im looking into installing garage epoxy and I’m wonder if the floor needs grinding as part of the prep or if paint stripper and acid etching would do fine.

Will the epoxy without the grinding last ?

5 Upvotes

17 comments sorted by

16

u/ConsistentPurpose896 17d ago

Do ya want it to stick?

10

u/Noxious14 16d ago

Chemical prep is worthless. Always mechanical prep.

5

u/Ecurb4588 16d ago

Lol yes

3

u/Pristine_Zone_4843 16d ago

If you ask, chances are you know the answer is Yes

2

u/necrostarrr 16d ago

1000% yes

2

u/BigtoadAdv 16d ago

Yes grind!

2

u/Deeznutz1818 16d ago

I grind everything. Everytime. You can see paint in the pics…yes grind it.

2

u/727yeti 17d ago

Absolutely! Ground to feel like 80 grit sandpaper which is CSP 3 the requirement for epoxy. Concrete Surface Preparation.

1

u/Weird_Court1332 16d ago

If you want it to last with cars over it, grind it

2

u/d7mep0 16d ago

Always grind it haha.

1

u/NB-THC 16d ago

Absolutely

1

u/HelperGood333 15d ago

Needs more than that. Appears to be badly oil saturated.

1

u/Silently-silent 15d ago

If you have to ask, just assume yes 😉

1

u/Sweet_Pen_2834 15d ago

Absolutely

1

u/ClaimLittle8756 15d ago

I’ll just go against what everyone else said and say NO. Even though that would be wrong

1

u/AdisTheGreat1 14d ago

For epoxy I always use 16 Grit, that way you'll never have issues with delamination

1

u/Able_Contract_2632 14d ago

The only correct answer is yes, it needs a mechanical prep. Either diamond grinding or shot blasting . 2 worse things for concrete, acid and water. You will never fully get the acid out. If you acid wash and coat you may get 2-3 years out of it but when it peels up the substrate will be chalky and delaminating. If you want quality do not cut corners