Prep etch/grind/powerwash question

[elmariachi]

Need some opinions:

Unable to find a commercial grinder I rented a 7" hand grinder and spent all weekend on my hand and knees. I have pressure washed it to remove the dust and it clean enough that you could eat on it. And based upon close inpection, it appears to be very, very open and porous. But...it is not equiavlent to 100 grit. I have compared it to sandpaper I have and its much closer to 180 or 200 grit. This forum has me ultra-paranoid about surface prep so, am I being overly-concerned or do I need to use a solution as a final step to etch this?

Replies appreciated.

 

[srracer]

I too would like to know the answer to this question. I just finished etching/powerwashing my floor this weekend, and though I achieved 100 grit in some areas, most is in the 150-200 grit range. I'm hoping to put down the bondtite next weekend, but if necessary, I'll do another weekend of acid etching...

-Chris

 

['the epoxy floor guy']

Does it ALL have to be EXACTLY like 100 grit NO. BUT I would definitely make sure (If you have a failure it will be in these areas):

The tire track paths are AT LEAST 100 grit.

Any 'walk paths' such as from a walk in door to the house has a more coarse texture.

Any areas you may spend time such as in front of a work bench.

YOU CANNOT OVERPREP

I cannot Emphasize enough TIRE TRACKS !!!! If you cannot get the texture with your acid etch. You can help by using a 4" grinder and an abrasive wheel made for masonry.