A few weeks ago I had an accident where a can of shellac on the top of my
shelf in the garage fell and splashed everywhere ... indoor and outdoor.
Some of the stuff I was able to clean off, some threw away but the stains on
the concrete pad outside the garage door is very visible. Someone suggested
denatured alcohol, which I have on two occasions tried and scrub scrub
scrub, it seemed to fade a little, but so little it may be just my
imagination. Are there anything else I can try to get rid of these stains?
Pictures of the stains:
Wear over many years. Concrete is a porous material, lots of places for
something to get into. Alcohol is the right solvent, but you are going to
dissolve it, spread it, and pick up some, but not all of it. Repeat that 50
times and there will still be some residue.
May be easier to just shellac the entire floor.
Soak a paper towel in alcohol, place it over the stain, put some
plastic wrap over the paper towel (so it won't evaporate so quickly),
wait 30 minutes, then wipe off the shellac. You may need to repeat
the procedure if the shellac is thick.
Try this on one tile: soak paper towel with denatured alcohol, lay it on
the tile, cover right away with tin foil weighed down so it doesn't lift
up. Let it soak an hour or so, mop up whatever liquifies with a clean
rag (mebbe a touch of d.a. on the rag). It should dissolve in alcohol,
and scrubbing doesn't do much if it hasn't dissolved.
I fixed a neighbor's wood-stain-on-concrete problem with acryllic craft
paints. I had already tried paint remover on the same concrete deck and
it didn't touch it. It certainly disguised it, but doesn't get much
If you look on the back of the can of shellac, you'll see that it recommends
denatured alcohol or household ammonia. It is my experience that the
ammonia works better than the alcohol for cleaning up shellac, as amazing as
denatured alcohol is.
The trick with denatured alcohol, BTW, is to use a lot of it at once.
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