[oldsch]

Hi
About how long should oil primers such as A-100 take to dry and how dry should they be before topcoat? I used A-100 on ext. wood and old paint (scraped and sanded) about 4 days ago and it is dry in places but will still scrape off with a fingernail pretty easily. Not 'tacky' but kind of 'gummy'. Is this normal? I'm not a painter, I restore millwork and often need to prime. First time using A-100. Do I have a problem here? Thanks

 

[bikerboy]

Not trying to be smart, but what you are looking for is on the lable. And yes, it sounds like you have a problem. Did you paint over wet wood? Or is it really (really,really) humid where you are?

 

[TooledUp]

Yup, like bikerboy says, sounds like you've painted over wet wood or the atmosphere is damp/humid. It could also be that you've used a can of paint that's been sitting around for a while and all the sediment is at the bottom, in which case, it hasn't been stirred up enough.

 

[NACE]

also, where is the wood stored? Is it close together in a small room? Was the primer put on too thick? The solvent needs to escape from the film and if it is humid, stored close together, or in a closed area with little or no air circulation, it will take a long time to dry. Solvent escapes out in the air, and oxygen needs to get to the alkyd. If there is a barrier or humid air, you need to remove the humidity or increase circulation. That is a long oil primer and will take a long time to dry, but it will also penetrate deeper into the wood. Hope that helps