Grit for Grinding

[Annie112]

Hello.
I have a new home & the garage floor is about 8-9 weeks old with no sealer. I am looking to grind & apply polyurea.

The Home Depot near me is getting a new diamabrush prep tool with a 30 grit surface. Will this be too coarse? I read that 40-60 grit was recommended.

Thanks for all the helpful info on this site.
Ann

 

[EpoxyCentral]

Hi Annie112,

This is all depends on the condition that your floor is in. Sounds like because you have a new floor with no pre existing coating #30 grit might be a bit too heavy duty for you. I would recommend going with a higher grit for this application anywhere between 40-60 would be fine.

 

[Shea]

Because the Diamabrush blades are flexible, they will won't be as aggressive as 30 grit discs under a heavier machine. You should be just fine with it.

 

[Armorpoxy]

Agree with Shea but if you are using a thin mil coating, scratch marks could be visible so make sure no visible deep scratch marks. Dianmabrush makes the blades in 100 grit too which we prefer to prevent the problem.