New Skylight: Dicor, or Eternabond, or both?

wgriswold wrote:
If your new skylight is polycarbonate (Lexan?) do not use Dicor. There is a different caulk that is recommended, but I can't remember the name.

This is the list I got from my polycarbonate skylight manufacturer (Majestic Formed Plastics), also RTV 5818.

Recommended Sealants, Gaskets, & Tape

Type Mfg Prod Name

Silicone General Elec Waterford NY 800-255-8886 Ultrapruf Sealant

Silicone General Elec Waterford NY 800-255-8886 Silpruf Sealant

Silicone General Elec Waterford NY 800-255-8886 Construction 1200 Sealant

Silicone General Elec Waterford NY 800-255-8886 Construction 1000 Sealant

Gasket/Tape Norton Co Granville NY 800-724-0883 Norrene® Foam V-2100 UrethaneSeries

Gasket Tremco Columbus OH 800-321-6357 Silicone (70 Durometer) EPDM (60, 70Durometer)

Tape Tremco Cleveland OH 800-321-7906 440 Tape

Butyl Tape PTI Dayton OH 800-543-7570 303,606

Butyl Tape Schnee-Morehead Irving TX 241-438-9111 Isocryl 5600 Series

Aluminum
Mesh Tape DRG Sellotape Utrecht Holland 030 44 33 44 Sellotape BV Vent Tape

Vent Tape 3M Minneapolis MN 612-733-1110 Tape 394


COMPATIBLE CLEANERS FOR SKYLIGHTS: The following cleaning agents have been found compatible with polycarbonate skylights. The manufacturer’s recommendations & instructions should be followed. FORMULA 409 (Reg. trademark of Clorox Company), JOY and TOP JOB (Reg. trademarks of Proctor & Gamble), PALMOLIVE LIQUID (Reg. trademark of Colgate Polmolive), WINDEX with AMMONIA D (Reg. trademark of Drackett Products Co.), VM&P grade naptha, Freon TF.


CAUTION: System compatibility is essential to ensure long-term performance of polycarbonate skylights. Do not expose polycarbonate skylights to solvents such as acetone, toluene or methylene chloride. Before choosing a sealant for your skylight installation, check the sealant’s compatibility with polycarbonate.


Sealant manufacturers will be able to assist you with compatibility inquiries.