I sprayed drywall texure for orange peel finish on walls using a larger texturizing machine over a wall that had been previously painted and primed. When texture dried, I noticed that there are several pock marks in the texture. It is like the spray blotches caved in in many areas when the spray texture dried. I have never had this happen before. I was using a Graco RTX1500 that is much more powerful than hopper/compressor outfit I have used before. Anyone have this problem when spraying texture and if so, what causes this and how did you take care of problem?
Edited 1/14/2008 12:51 am ET by RickC
Replies
over a wall that had been previously painted and primed.
Wall surface contaminated ?
If the problem, called cratering in the coatings industry, is random it is ussually contamination of the substrate. If it is more wide spread than a few spots, it is something in the finish itself, or the equipment used to apply it.
Since it is spray texture, my guess would be the wall.
Try washing the next painted wall before spraying the texture. People stick all kinds of stuff on their walls. Post-Its, tape, and kids have a way of leaving unseen contaminates.
Dave
I did wash wall with TSP and even primed over some areas. I am wondering if one of the problems was too heavy of spray pattern when I overlapped sray on wall. Also, I mixed at a higher speed and had to remix when getting mud to right conisistency. I wonder if I introduced air bubbles.
That could do it.
Adding liquid soap to the batch might help. It reduces the suface tension so the bubles form or at least outgas immediately while you are spraying.
You might want to try a small test batch before you add any to a large mix.
Dave
Thanks Dave, I just have never experienced this before when using hand held hopper that does not have the power of the texturizing machine I was using. I appreciate input. I wasn't sure about dish soap in texture coat, but sounds like this could help.