Repairing plaster before painting

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Forum topic by phonewired posted 09-08-2008 02:15 AM 982 views 0 times favorited 1 reply Add to Favorites Watch
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43 posts in 4058 days

09-08-2008 02:15 AM

Well this is alot of wood working as a topic, but here are so many jocks with answers I thought someone may have run into this before. We have a store built in 1857. Plaster over soft brick. We are putting an antique mall in 2 large rooms. We tried to paint the plaster and the Kilz curled and fell off. There has been moisture problems in the past and the plaster is like powder in some places. Is there a primer made that might seal in the old plaster so we can do a finish coat over it? I am thinking of a quick fix of covering the wall up from the floor with a 2 foot to 4 foot section of drywall and glueing it to the plaster wall. Another option is studding it out and new drywall walls to hide the old. It was a shock when we came in after letting the Kilz dry for 2 days and it fell off! I have about 150 running feet to do. Thanks, Noel.

-- Noel, Iowa

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Scott Hildenbrand

71 posts in 3706 days

#1 posted 09-08-2008 04:13 AM

Get out a shop vac and vacuum it off with a good bristle brush attachment. Then you’ll want to break out a bucket with some water and a bit of vinegar in it. Clean off your walls and allow to dry. If there are any loose sections of plaster, you may was well remove them and plan on patching.

Once everything is dry and the plaster is stable, prime over it as you please.

Unless you have the plaster stable (no flaking, no powder, no nada) any painting you do will be a waste of time and money. Also, if there is an active moisture problem, fix it, else you will waste more money.

For patching deep sections of plaster loss I prefer to use true Plaster of Paris to fill it in then either do the final smooth coat with a standard skimcoat, or use a vinyl based joint compound.

Since you’re dealing with an antique store, a rustic look won’t be an issue for you. I’d seen several places leave any plaster off (where the brick shows) and just handle the plaster, leaving the brick exposed.

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