Spots after painting stand?

[Nem0]

It seems like regardless of how many coats of paint I'm using, these spots keep showing up...anyone know what they are and why they're occurring? It seems like theyre a bit damp. I'm letting the paint dry basically overnight before applying another layer and they keep popping up.

 

[Goodair]

Try sanding the area before repainting. Make sure its dry too. There were probally damp spots under the paint.

 

[gibbs.david]

If it’s like ceilings you may need to seal the surface first. If a ceiling has had water same you can paint numerous times but still shows through. There are sealants in your local DIY.

 

[George Lopez]

Did you seal it?

 

[Softhammer]

Kilz primer. But you need to be sure the wood underneath is totally dry

 

[WVNed]

It's probably sap or resin leaching out. In any case Kilz primer will fix it.