Thursday, February 11, 2010

After putting the glossy paint on,the drywall compound i used to repair the wall is visible through the paint?

i tried using 150 grit sandpaper pad to smooth the visible bumps caused by the underlying compound, but its not strong enough. Is there a special sandpaper that can penetrate the paint + primer or do i have to do something else?After putting the glossy paint on,the drywall compound i used to repair the wall is visible through the paint?
The problem is that the patch absorbed the paint faster than the surrounding painted areas because it wasn't primed first.





You can re-sand the area using drywall paper (150 grit, probably the same as you're using now) then put on a primer like Killz or Perma-White to seal the patch, then paint over that.





There's a technique to feathering in the edges of the patch. This and more about drywall sanding in the link below.After putting the glossy paint on,the drywall compound i used to repair the wall is visible through the paint?
The last thing I use when sanding compound is a sanding screen, you get one at the building supply. Depending on the primer and paint composition and quality, I have seen the the compounded areas dry darker than the surrounding dry wall. Compound is less porous than drywall. If I want a perfect finish I allow the compound to dry completely - at least a day, wipe down all the dust, and apply a good primer like B-I-N shellac white primer. Let dry a couple of hours and see if the color of the wall is even and if there is any really noticeable change in texture. If there is, re-sand with the screen and re-prime. There have been times I've had to wipe the compound with a damp fine sponge.


Since you already have paint in the wall, get a screen, re-sand and then prime the area. Slightly dilute your paint with water or solvent and put a few light coats on, feathering out. Let dry completely and and use full strength paint again, feathering out the edges. Match the direction of brush or roller strokes (using a good tapered brush) Better to use several thin coats than one heavy ones. In many ways a good paint job requires a bit of patience. If your glossy paint shows an edge where you stopped, try using a damp sponge (water or solvent) to feather the edges where you stopped.





Best of luck on your project.


SM
Now you know why sanding before painting to get a flawless surface is one of the most tedious things about wood working and plaster work. Get heavy, coarse (40-60 grit) sand paper and take off the paint, primer and excess plaster, then sand smooth with various grades of paper until smooth, adding dry wall compound or other filler as needed, then repaint.
Moisten the sandpaper and re-sand the patch. Also, a high gloss paint will show EVERY imperfection on a wall. Reconsider the paint finish and opt for a satin - it's a little more forgiving but it still has a slight shimmer as opposed to a matte finish.





Good luck.
120 grit is usually good. 1st of all glossy paints show defects alot more than flat. if its just spackle showing thru, you probably didn't use enough primer. reprime area and repaint wall
Get 60 grit.
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