Pin holes in paint

[dadstoy]

I'm painting some interior trim and I'm getting pin holes or craters where the paint isn't covering. What causes this? Its probably too cold and the humidity is probably too high, but that's what I have to work with. Any ideas/suggestions?

Thanks

[idroba]

My experience with this is that the pinholes are from tiny water droplets. If you are spraying paint, especially when it is cool or cold, the propellent is colder than the dew point of the air which causes tiny drops of water to become entrained in the spray. If you are brushing the paint on, my guess is that the surface is not dry enough.

My best shot, at any rate. You must work in higher temps and lower humidity, that is the only solution.

[mike warren]

Your problem could be oils or silicone on the surface your trying to paint. You might want to clean the area with wax and grease remover and maybe some warm soapy water. Then rinse thoroughly with clean water.

[92landyacht]

Yep, my guess is silicone or oils as well. The problem is called "fisheye" and comes from contaminants that repel the paint on contact. A good degreasing should fix the problem. You'll need to sand down the areas that you've sprayed and start over after you've degreased it. One more reason to not use silicone inside or out IMHO.