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- Newsgroups: misc.consumers.house
- Path: sparky!uunet!think.com!spool.mu.edu!umn.edu!mmm.serc.3m.com!news
- From: schultz@halley.est.3m.com (John C. Schultz)
- Subject: Re: Epoxy paint on concrete floors
- Message-ID: <SCHULTZ.92Dec27183733@halley.est.3m.com>
- In-reply-to: gregw@NeoSoft.com's message of Sat, 26 Dec 1992 16:40:06 GMT
- Sender: news@mmm.serc.3m.com
- Organization: 3M Company, 3M Center, Minnesota, USA
- References: <BzvKyw.Ey8@NeoSoft.com>
- Date: Mon, 28 Dec 92 00:42:45 GMT
- Lines: 81
-
- In article <BzvKyw.Ey8@NeoSoft.com> gregw@NeoSoft.com (Greg White) writes:
-
- My thoughts were to level out any rough spots in the concrete slab
- ^^^^^^^^^
- Your concrete slab should (?) be smooth enough not to need leveling. I
- think that a thin coating of anything would tend to chip much more
- than the couple inches of concrete used for the floor.
-
- and paint the floor with a durable epoxy paint decorated with
- designs and washable throw rugs.
-
- I have used a two-part epoxy paint from Sherwin Williams with excellent
- results. You need to ask for it because it is not normally displayed. It is
- called an "Industrial Maintenance Coating, Tile-Clad II Enamel". I have
- painted part of the garage floor and my shop floor with this epoxy. I
- apparently spread it quite a bit thinner than recommended because I got about
- 50% or so more coverage than the can recommended (185 sq ft/gallon - 9 mils
- thick wet). It seems OK however because it is still there after two MN
- winters. Probably even my garage floor does not take the beating an
- industrial environment would mete out.
-
- Sherwin Williams sells a wide variety of colors and could probably mix about
- any color you had in mind - I used a battleship gray but you could go with
- flourscent orange if you have a wild side (or are color blind :-)
-
- You have to prepare concrete by etching with muriatic acid (dilute
- hyrdochloric acid). Muriatic acid is sold in hardware stores by the gallon.
- The fumes given off by the etching process are toxic (chlorine). Newly poured
- concrete must not be painted for 30 (?) days to allow time for it to fully
- cure. I poured the acid direct onto the floor in a room with all the windows
- open, wearing a face mask and with a good breeze blowing (it was summer). I
- swished the acid around with an old broom and old shoes and washed the room
- down with lots of water. There was not much left of the broom when I was
- done. An old mop would work OK also. Avoid metal since the acid seems to eat
- that faster.
-
- The surface to be painted must be between 55 and 95 F. The mixed life of the
- epoxy, called the pot life, is about 8 hours
-
- The paint will not hide the inevitable cracks in the concrete slab.
-
- As far as I know, no chemical will remove epoxy paint once is cured (maybe
- acid?). MEK (methyl ethyl ketone) can be used for cleanup before the resin
- cures but not afterwards.
-
- Drying epoxy paint also smells terrible (the carrier solvents are xylene,
- mineral spirits and naptha). You may want to schedule a week where everyone
- lives someplace else so you can prepare and paint the floor.
-
- I have no idea if you can lay tile over epoxy - you better check with a tile
- store because as I mentioned, nothing is going to remove cured epoxy paint.
- I would guesstimate that some ceramic adhesives will not stick to epoxy paint.
- the manufacturer does not recommend epoxy for immersion service.
-
- I would recommend that you sprinkle some fine silica or other small grit
- material on the drying epoxy. I did not and almost broke my neck the first
- time I stepped on the SLICK surface when it was wet. Eventually the surface
- gets abraded enough to be walkable but some fine grain silica (e.g.
- sandblasting silica) would certainly help. Perhaps you could mix the silica
- with the paint and paint the mixture to get a more even application.
-
- I applied the epoxy with a short nap roller. I threw the roller away rather
- than trying to clean it.
-
- This particular epoxy paint takes 2 weeks to fully cure. You can walk on it
- the next day but you shouldn't drive on it or probably put heavy objects like
- furniture on it for a week.
-
- As for epoxy's stability, I no longer wory about gas, brake cleaner, engine
- degreaser, salt, oil, paint thinner, brake fluid, methanol or paint getting on
- the floor in the garage or shop. Most things just wipe off. Paint can be
- disolved and wiped off. Note however that the epoxy is no stronger than the
- underlying surface and concrete will still chip.
-
- The biggest drawback besides the preparation is the cost. About $25 per
- gallon and the minimum quantity is a gallon of hardner and a gallon of enamel.
- Still pretty cheap as floor coverings go.
-
- --
- John C. Schultz +1 (612) 733-4047 schultz@halley.serc.3m.com
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