Some specialty caulks may need a primer before paint is applied, but most caulking is paintable. Caulk should dry before painting over it, otherwise it can cause new paint to crack and warp.

Can you leave caulk unpainted?

Acrylic and silicone are the types of caulk you're most likely to use on windows, siding and outdoor trim because they are waterproof and flexible. Caulk has to cure before it becomes waterproof, however, and except for a few products, it's best to leave caulk unpainted until curing is complete.

Can you paint directly over caulk?

While 100% silicone caulk will stick fine to paint, paint won't stick to 100% silicone caulk. If you plan to paint over the caulking, use a paintable caulk that contains silicone and resists mildew. If not, 100% silicone caulk is fine to use.