Sealant Types

Don Casey Tip #45 Sealant Shorthand What type sealant to use can be confusing. Here is the code:

• Use silicone to electrically insulate dissimilar metals and to bed plastic.

• Use polyurethane only to join components that will NEVER need to be disassembled.

• Use polysulfide for everything else.

There are exceptions, but following these three rules will avoid most wrong-choice problems.