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To any of those who responded to my question about having problems with hard spots forming randomly in drywall compound… I had a representative from the compound manufacturer take a look at the problem, and didn’t get too much resolution. The problem was attributed to differences in “suction” (i.e. the evaporation process), which is how the ready-mix compound hardens. He wasn’t sure why it was happening, but felt that something under the compound (old paint, plaster, whatever) was causing the problem. He recommended using a setting joint compound for the skim coat that I’m applying, as setting joint compounds (as this month’s Fine Homebuilding discusses… deja vu??) cure via more of a chemical reaction that by evaporation.
Anyway, one last trick I haven’t tried but thought I’d pass on… the rep stated that he’s seen contractors thin down topping compound and apply it with a thin-nap roller to correct for surface irregularities such as paint defects, etc. He emphasized that 1. there are products out there made for this purpose, and 2. the compound manufacturer doesn’t recommend it because of the lack of testing done applying the compound in the fashion… but he said that the contractors seem to get good results by doing so. So… I figured I’d pass that tidbit on…
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thanks for coming back. too few do. go over to the tavern and I'll buy ya a cold one.
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To any of those who responded to my question about having problems with hard spots forming randomly in drywall compound... I had a representative from the compound manufacturer take a look at the problem, and didn't get too much resolution. The problem was attributed to differences in "suction" (i.e. the evaporation process), which is how the ready-mix compound hardens. He wasn't sure why it was happening, but felt that something under the compound (old paint, plaster, whatever) was causing the problem. He recommended using a setting joint compound for the skim coat that I'm applying, as setting joint compounds (as this month's Fine Homebuilding discusses... deja vu??) cure via more of a chemical reaction that by evaporation.
Anyway, one last trick I haven't tried but thought I'd pass on... the rep stated that he's seen contractors thin down topping compound and apply it with a thin-nap roller to correct for surface irregularities such as paint defects, etc. He emphasized that 1. there are products out there made for this purpose, and 2. the compound manufacturer doesn't recommend it because of the lack of testing done applying the compound in the fashion... but he said that the contractors seem to get good results by doing so. So... I figured I'd pass that tidbit on...