Sealant Types

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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.