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The unpredictability is a factor, but you can minimize your problems when you find a reliable combination of methods, and materials, then don't let anyone talk you into changing it.

I'm assuming the other painters here will agree, that you need to find products that work every time. It is a lot of hours and materials cost invested, to take a chance on something that isn't...

tow'd, Totally confused now? The only thing I will add is to use a catalyzed urethane primer. This is a great barrier coat, preventing interaction between the paint, and what is under the primer.
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