Sealant Usage For Polycarbonate Projects

Silicone:  Dow 999-A is specially formulated to be plastics compatible, adhering well to polycarbonate and metals – Not wood.  Always swipe areas to be sealed with a clean cloth, slightly saturated with rubbing alcohol.  Let dry and apply to this squeaky clean surface.  A 1/4″ x 1/4″ bead is best.

Big Stretch: This sealant works well in polycarbonate to wood applications.  3/16″ bead dries swiftly.  Often also used at Ridge Flashing to Polycarbonate, where higher winds may be present. Always swipe areas to be sealed with a clean cloth, slightly saturated with rubbing alcohol.  Let dry and apply to this squeaky clean surface.

Sikaflex 295-UV: This super strong sealant works well in polycarbonate to wood applications.  1/4″ bead best.  Often also used at Ridge and Valley Flashing to Polycarbonate, where extreme high winds may be present. Always swipe areas to be sealed with a clean cloth, slightly saturated with rubbing alcohol.  Let dry and apply to this squeaky clean surface.

Note: Silicone is available from Sundance Supply.  Local hardware stores have Big Stretch.   For Sikaflex see Jamestown Distributors.  Not cheap, but either is having wind blow up, or off, flashing.

Important: Always read and follow instructions, especially with Sikaflex.  Application +50 F to +95 F is typical and surface must be clean and oil free.  Low to medium humidity best.

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