COMPOSET PRODUCTS L.L.C.
COMPOSET PRODUCTS L.L.C.
sales@delamrepair.com
801-821-0964
Frequently Asked Questions- Sealants
What is the best sealant to use?
We prefer 1-part urethane sealant for durability and adhesive strength, while silicone provides the best appearance. We generally don't recommend solvent-based caulks which typically shrink, become brittle, and crack.   
 
What is caulk?
Caulking is a generic term referring to a liquid or paste that is used to seal a gap between two parts with the intent of making the joint waterproof.
 
What is polyurethane sealant?
Polyurethane sealant is a tough, high-performance, high-adhesion reactive chemistry sealing compound that has the potential to outlast and outseal traditional products. It does not shrink and dry out. It does have a low-luster finish that tends to attract dirt.
 
What is silicone sealant?
Silicone sealant is a high-performance reactive chemistry sealing compound that has the potential to outlast and outseal traditional products. It does not shrink and dry out. It has a high-gloss finish that is not paintable.
 
What is solvent-base caulk?
Solvent-base caulks dry by the evaporation of chemicals such as naphtha, acetone, toluene, benzene, xylene. As the solvents evaporate, the caulk tends to shrink, dry out, and crack. They do stick to dirty surfaces, however the long term durability is questionable and we don't recommend them.
 
How can i tell if my caulking is good?
Visual cues are missing caulk, cracks, dried gaskets, staining, etc. The best way to test for leaks is by performing a "blower door test".
 
What is butyl tape?
Butyl tape is a pliable putty filler with a high solvent (butyl) content. These tapes are typically used under window frames and trim strips. They have moderate adhesive quality though are prone to drying out and shrinking. Installed correctly they have the potential to provide a good seal, however they should be combined with a bead of sealant.
 
Can I just run a bead of caulk over the original caulking?
Like most maintenance work, preparation is the key to a good job. Removing the old sealant and cleaning the aged sealants from the parts is key. Preparation generally takes the most effort and time, and like painting, the application of the caulk is the last step. In many instances the seal or gasket is behind a door or window requiring removal of the object to replace the seal.
RV Delamination Repair System and Sealants