Caulking Failure - Causes & Solutions

Some of the most common reasons for caulking failure are using inferior-quality caulk, using the wrong caulk for the job, not preparing the surface properly and not using a sufficient amount of the caulking. The two primary types of caulking failures are adhesive failure and cohesive failure. There are different types of caulking intended for different kinds of jobs, and the most important ways to prevent problems are choosing the right caulk and preparing the surface correctly.

Adhesive and cohesive failures

Adhesive failure means that the caulk stops adhering to one or both surfaces to which it was applied. This type of failure might not appear right away, so proper testing and preparation of the surface is critical. Test a small area for adhesive compatibility prior to starting the job. Do this with and without the recommended primers. Prior to applying the caulk, clean the area thoroughly so the caulking adheres to the surfaces properly. Cohesive failure happens when there is a tear within the caulking itself, not in the adhesion to the surfaces, which frequently occurs as a result of sealant deterioration.

Water-based caulks

Water-based caulks are easy to use and are best applied in dry conditions to allow sufficient time to cure. These caulks can withstand moisture once they have set. The latex, or water-based, caulks are best applied in temperatures over 40 degrees F.

Silicone caulks

Silicone caulking is more difficult to work with, however, it is more flexible in nature and performs well when used on glass and metal. Applying this type of caulk in cold weather is not a problem, unlike the latex style of caulking.

For caulking projects, a high-quality caulk is essential to obtain the best results. Preventing failures in caulking is often just a matter of applying it correctly and choosing the right type of caulk for the job.

Primers and Finishes

Priming is essential for better adhesion, sheen uniformity, mildew control and durability.
Select a top quality interior paint in the color and sheen of your choice.

Substrates and Primers

Substrate: Wood
Primer: 975 Acry-Plex Enamel Undercoat
Finish Coats: 550 Super Latex Interior Flat Wall Paint
1610 Sat-N-Sheen Int. Low Sheen Finish
1650 Acry-Plex Interior Latex Semi-Gloss
1685 Dura-Poxy + Int./Ext. Semi-Gloss Acrylic En.
1680 Dura-Poxy + Int./Ext. Gloss Acrylic En.
Substrate: Metal
Primer: 1725 Kel-Guard Acrylic Metal Primer
Finish Coats: 550 Super Latex Interior Flat Wall Paint
1610 Sat-N-Sheen Int. Low Sheen Finish
1650 Acry-Plex Interior Latex Semi-Gloss
1685 Dura-Poxy + Int./Ext. Semi-Gloss Acrylic En.
1680 Dura-Poxy + Int./Ext. Gloss Acrylic En.
Substrate: Masonry
Primer: 247 Chem-Guard Acrylic Primer
Finish Coats: 550 Super Latex Interior Flat Wall Paint
1610 Sat-N-Sheen Int. Low Sheen Finish
1650 Acry-Plex Interior Latex Semi-Gloss
1685 Dura-Poxy + Int./Ext. Semi-Gloss Acrylic En.
1680 Dura-Poxy + Int./Ext. Gloss Acrylic En.

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