Just use a really good concrete cleaner (Home Depot/Lowes) on the
porch before painting.
If there are oil stains a primer is a good idea. Actually a primer is
always a good idea
as it acts as a sealant and makes your paint job last longer and look
Has it been painted before? I ask because my concrete front porch had
been painted every year with an OIL-BASED paint, no longer available
Now, in order to prep the surface for the new permitted paint, I have
to prime it. It's BM, and I had the primer colored to match the
new paint. PITA, but short of transporting paint across state lines
<g> what to do?
If never painted before, I'd ask at a good paint store NOT a box
store. I betcha they will say yes, prime it. Primer + finish coat
will probably hide stains, esp. if you are using a dark color.
Get the very best you can afford, esp if you are in a severe weather
area where paint takes a beating.
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