Cannot be painted over. Sometimes drys out and falls out. You can use your finger with this. Read each statement carefully. One should use a silicone sealant to seal dissimilar materials.
Butyl rubber is recommended for use because it cleans up easily with water.
Oil base caulks are among the more costly sealants. A caulking gun is not useful when wanting a neat and exact bead. It is better to skimp on sealants than use too much. Areas that should not be caulked are concrete parts and sole plates. Sealants work best when applied after construction.