Caulks are used by painters to seal interior and exterior joints---such as the gaps between trim and walls or fascia boards and siding or---before painting. Not all caulks are created equal. Some can withstand the elements, while others can be only used indoors. Some caulks cannot be painted, an important consideration for painters.
Siliconized Acrylic Caulk
Siliconized acrylic caulk is a common caulk for painters. It can be used inside, outside and applied in a variety of temperatures. It sticks to many surfaces, lasts for many years and can be painted with acrylic or alkyd (oil) paints.
Polyurethane Caulk
Some painters prefer polyurethane caulk because the way it stretches--- 300 percent or more---and fills gaps. It sticks to all surfaces, is very durable and can be painted. However, it is difficult to apply, can be expensive and its fumes are hazardous.
Elastomeric Caulk
Elastomeric caulk is latex-based and will fill gaps of up to half an inch. Painters like to use it for exterior projects because it will move with the house and remain strong. According to House Painting Info, it will stretch 200 percent or more, depending on the brand. Elastomeric caulk dries quickly and accepts any type of paint. It can also be used indoors.
Hybrid Caulks
Hybrid caulks are always being developed. They combine characteristics of polyurethane, silicone and water-based caulks, according to Fine Homebuilding. That means they are flexible and can stand up to the elements, which makes them suitable for many applications. They can be painted with latex paints, and oil-based paints if a latex primer is used. Many hybrid varieties are available, but they can be expensive.
Latex Caulk
This water-based product is what many homeowners think of as "painter's caulk." They use it when sealing around interior trim before painting. A tube of latex caulk can cost less than $2, according to Fine Homebuillding, and it meets the need for nice-looking joints around interior doors, windows, baseboard and crown moldings. Latex caulk isn't recommended for exterior uses, according to House Painting Info.
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