When it comes to caulk, the conventional wisdom is that there are three basic kinds: acrylic, alkyd and silicone. To seal small gaps in the bathroom, you use a waterproof silicone caulk, which can close up tub and sink surrounds and bridge gaps in tile transitions. Most silicone caulks are not paintable. For interior woodwork, like where crown molding meets a wall or ceiling, or the corners where an imperfect miter joint allows baseboard ends to separate, use premium acrylic, which can be painted. The problem is that for many areas, such as around windows or doors, you want a caulk that will expand and contract and is paintable. Continue reading →