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What's the Difference?

What’s the Difference: Paintable Caulk

Does price matter, or is a latex caulk by any other name still the same?

By Rob Yagid Issue 200

When it came to finish carpentry, a former boss of mine had a simple motto: “Do your best; caulk the rest.” He was a framer.

Caulk should never replace tight-fitting joints, but it should be used to make paint-grade projects look seamless and to block air and moisture from going where they’re not supposed to. Although a variety of paintable caulks are available, such as polyurethane caulk, which is also highly toxic, you’ll often encounter acrylic-latex caulk that comes with silicone or without it.

Let’s compare siliconized and acrylic-latex paintable caulks. Unless you’re a chemist, you likely wouldn’t notice much of a difference between them, but one does hold an edge over the other. Of course, it depends on your project. You may find that one paintable caulk better suits your needs.

Siliconized acrylic-latex caulk adheres better

siliconized acrylic-latex caulk
Take their word for it. One company stated, “Siliconized acryliclatex caulk is preferred for any application where better adhesion and durability are desired.”

I have always assumed that siliconized acrylic-latex caulk was primarily designed for exterior use. After all, silicone is waterproof, and interior casing should never get wet. But beyond improved water resistance, siliconized acrylic caulk has superior adhesion, which means it creates a more durable joint that will last longer indoors or outdoors. Siliconized acrylic-latex caulk also tends to be more flexible, especially in low temperatures, which means it’s less likely to crack.

Cost: Around $2 per 10.1-oz. tube

Acrylic-latex caulk is less expensive—barely

Acrylic-latex caulk
You get what you pay for. Your house won’t fall down if you use regular acrylic caulk, but your painted joints will be more susceptible to failure.

Choosing acrylic-latex caulk over siliconized acrylic latex would be tough to justify. It’s typically less expensive, but the cost difference is rarely more than a few cents—maybe a couple of bucks if bought in bulk. Both types of caulk can be tooled with a wet finger, cleaned up with water, and painted with oil- or water-based paints. The message I received from manufacturers is that there isn’t an application where siliconized acrylic-latex caulk can’t replace acrylic-latex caulk and do a better job.

Cost: Around $2 per 10.1-oz. tube

Photos by: Krysta S. Doerfler

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Previous: Making Sense of Caulks and Sealants Next: No-Crack Caulking

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Intro to Painting
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Wallpaper
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Windows and Doors
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  • Video Series: Finishing an Exterior Door
Spray Painting Interiors
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Exterior Painting
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