Patch with rustoleum than sanded ... how to get depressions?

[workhurts]

So, I finally ordered my epoxy and should have this never ending summer project complete within a week or two.

I had some minor cracks and pitting of the floor so I filled it with rustoleum epoxy patch which is a two parts 100% solids patch kit. For almost all the cracks or pitting I overfilled and sanded down using a 50 grit concrete sanding pad on a random orbital.

There are one or two spots that I didnt overfill so the epoxy in the depression is nice and shiny and I can't seem to get to them with the orbital. How do I go about sanding it so that my full coat of epoxy adheres properly? I guess I could hand sand it. It's minor ... like the size of a dime in a couple of spots only one of which could potentially be under a tire.

I sanding that little bit by hand will any piece of sandpaper work on epoxy?

In case anyone is wondering those 4" concrete polishing disks that they sell on eBay for a couple bucks a piece actually work decent enough. Used them on all the cracks after patching them and they are all nice and flush cept for the areas I underfilled of course.

 

[shaun oriold1]

Go for it! You'll find out if it works or not - I'll spoil the suspense and say: it will.... Get in there with sand paper on your hand and scuff it up. If you have the time, re-fill it, and sand it down again to make it perfectly flat - of if you're putting flake down, just go heavy in that spot to level it best you can.

Dont sweat the small things.

 

[drinkmoresake]

I would check with Rustoleum but I seem to recall they told me that you don't even need to sand their epoxy patch product so long as the epoxy is applied within "x" days. I know I did not sand the few spots where I applied it and it has been about 15 months since I applied the epoxy and no signs of trouble. But I like I said, check with Rustoleum.

 

[pauls_workshop]

hi workhurts,

you should scuff up the top just lightly. Or better yet, fill it in, overfill, and grind it flat. You don't really want depressions in the finished floor do you? You'll have those if you don't do the above. The epoxy basecoat will be a couple sheets of paper thick and won't fill in larger depressions to be flat. - Paul

 

[Amanda]

I agree with drinkmoresake, you may not need to sand at all. Check with Rustoleum.

 

[workhurts]

Rustoleum says to sand ... so I will sand. The stuff fully cures in 8 hours and they tell you to add a second coat after 2 hours if you need to. If it stays on longer than the 8 hours they suggest sanding with 60 grit. I'm going to sand and recoat using the same patch to level things out.

Some pictures for you:

 

[Dave Maxwell]

Could I use that to fill in where rocks popped up through new concrete? Also if I do this, should I do it before or after I grind? Didn't know if grinder would rip it out

 

[Shea]

Yes, just make sure the hole is clean and dry and do it before you grind.