The best method is a scarification machine, like a blast track
http://www.tcsdivisions.com/blast-tracking It will remove everything and
leave nice, open pore concrete for the epoxy bond to. Muriatic can often
get all the painted steel in the garage rusting, if you dont ventilate well
enough. The problem with a blast track is that for just painting a floor, it
might leave grooves in the concrete; its that tough on the floor. We used
them when we were troweling on a sand/epoxy mix < inch thick. That was a
tough floor.
For home use, or small areas, we often used diamond stones on commercial
floor polishers to grind off the surface finished and top layer of concrete.
This is what I would use to prep for paint in my home garage. It cleans off
all coatings, gets to open pore concrete and smoothes out the concrete at
the same time.
Jack
_____
From: Elton E. (Tony) Clark [mailto:eltonclark@gmail.com]
Sent: Monday, November 18, 2013 7:30 PM
To: Jack Brooks; Shop Talk List
Subject: Re: [Shop-talk] Epoxy floor
Third time's the charm;
I had to learn the hard way but the "etch" process is critical: one can't
just pour and broom around muriatic acid in etching; what worked for me is
to use a big plastic watering can from the garden store: make sure every
square inch of floor gets contact with fresh acid from the sprinkler. The
acid is quickly "killed" by it's reaction with the concrete and becomes
neutralized it seems to me.
On 18 November 2013 21:01, Jack Brooks <jibjib@att.net> wrote:
On 10/30/2013 1:55 PM, Doug Braun wrote:
> My garage is 24' x 24' with a nice smooth crack-free concrete floor, and
> the house is about 30 years old. When I bought the house 7 years ago, I
> painted the floor with epoxy (one of those kits form HD). I did a careful
> job with the prep, including a power-washing and an acid etch, and the job
> looked great for a while, but after a couple of years it started
> blistering, and and now it has random bare spots all over the place.
During your wet season duct tape a 2x2 foot square of plastic over one or
more of the blistered areas and see if you get condensation under there
after a few days. Unless those spots were still a bit oily, moisture might
be your issue.
Jack
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