I also reduce it 10%. The PPG rep advised me to. Otherwise it lays down real fuzzy.
Regarding the adhesion problem- what did you wash the surface with, and how many coats of DX did you apply?
The only time I had a similar problem, I had applied to much in an area where I overlapped wet coats. I DA'ed back off to where it featheredged. Now I only lay on one medium wet coat, just enough to give the metal a slight yellow tint. Wait at least 15 minutes, hit it with a red scotchbrite and then DP90.
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