Cracks and gaps along baseboards, windows, doors, and ceiling trim need to be properly sealed prior to painting. Caulking gives you a smooth edge and a clean professional look. Caulking also reduces airflow around doors and windows to save energy, prevent water leaks, and block out insects.
No matter where you're caulking, it's important to get a smooth, even bead across the surface. Cut the tip straight across or at a slight angle, but don't make the opening too big. The tip opening should be slightly smaller than the bead size you need. Using painter's tape will help you control caulk lines and get a cleaner edge. Caulk small sections at a time and continuously keep the caulk moving for an even bead.
Knowing which type of caulk you need will save time and improve results. Selecting caulk will depend on the area you are planning to repair; some types of caulks are paintable while others are better for sealing around plumbing fixtures, or windows. Here are the types of caulks, their benefits, and where best to use them:
For painting purposes, a quality latex caulk or siliconized latex caulk is the best choice. Sometimes referred to as "painter's caulk", these caulks are ideal for sealing interior windows, doors, and trim, and for filling small cracks and holes in drywall or baseboards.
Silicone caulk is designed to seal gaps around bathtubs, showers, toilets, sinks, and countertops. Most silicone caulk is not paintable and not recommended for filling cracks or spaces around walls and doors.
Benefits of silicone caulk:
Latex sealants protect exterior surfaces from the elements. Latex sealants are paintable, durable, and flexible enough to withstand expansion and contraction without cracking or losing its seal.
Benefits of latex sealants:
A caulking gun is the most common way to apply caulk inside or out. Caulking guns provide a more continuous bead. Look for guns with a built-in tip cutter and cartridge piercer to make caulk application fast and easy. For smaller jobs, a squeeze tube like the DAP Alex Fast Dry Caulk Plus is simple way to fill in holes and cracks. Because caulk is applied by hand, it's important to maintain a steady pressure. Cartridges generally hold 9-11 ounces of caulk, while tubes hold 3-6 ounces.
For best caulking results:
Use a high performance silicone caulk when temperatures are cold. Latex caulking will freeze, and should only be used when temperatures are between 40°F to 80°F. Keep tubes of caulking warm, by storing them indoors. Cold caulk will not flow smoothly, and may not seal or fill as expected.