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paint drying with wrinkles

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shatteredzman:
I am having a problem with my paint drying with wrinkles. I am using spray paint and it goes on smooth but after about a minute wrinkles begin to form. I have tried sanding with 400 grit and 220 grit sand paper between coats but they still show up. I have tried putting on thin coats as well as thick coats. This is happening on more then 1 piece of MDF. What is causing these wrinkles?

javeryh:
Did you seal the MDF with some good primer or water/glue?  MDF is very porous and may be sucking the paint into itself.

King Nerd:
Did you make sure that it was completely cleaned of any oils or anything on the surface, or even in, the wood?
Did you use a primer?
Are you waiting long enough between coats?
What kind of spray?

isucamper:
I second the primer remark.

I used spray paint for my final coat, and I would get these wrinkles in areas that were not WELL primed. 

Actually, I would get these wrinkles if I didn't prime AND apply a coat of roll on paint.  Or if I sanded too much before spraying. 

Also, be sure your not using water based primer and oil based spray paint.  That could have been causing it for me as well.  I never did get to the bottom of why this was happening to me, but I found a formula that worked.  2 coats of primer, 1 coat of roll on, then spray, sanding in between each.

Turnarcades:
MDF does not respond well to spray paints if built up to this kind of level as you need an excellent base with several primer coats if you want a gloss finish with the spray. You may do better to rub down and use an alternative.

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