Thanks, and I was afraid of that. I am guessing you are right about trapping moisture.
I am surprised the paint will stick well using such fine grit. I don't think the primer was the culprit,but I probably won't use it again. The rattle cans I now use are fine without it, and actually seem to have as much solid content as DC's sanding primer. MTN 94 spray paint seems ok regardless or Miami's unpredictable weather . It even did fine on the day I got a few drops of rain on it. One less headache...
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