Join Date: Dec 2002
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Alternative to screws?
As the original question implies; screws are not recommended hardware fasteners in for Poly’ applications.
I’ve used Blind Rivets and Gaskets, with moderate success. If you have access to the “blind” side of the hull/deck, you would be better off using Nuts & Bolts (in lieu of rivets).
Drill out the hull for a slightly snug fit (rivet or bolt diameter).
Clean the area to be covered by the hardware (footprint) with alcohol.
Apply a plastic gasket (ie: Silicone Sealant, or other) to both the hull (hardware footprint) & the hardware.
Fit the hardware to the hull while gasket is still pliable; hold in place (the challenge) until gasket sets. Do not squeeze out the gasket. The Silicone gasket will not adhere to the Poly’ - it’s just a flexible gasket that will “seal” the holes due to mechanical clamping (compression) pressure.
Apply the rivet(s) through the hardware (mounting holes) and the hull (holes). The efficacy of this method relies on a continuous compressible gasket, and the clamping pressure of the rivet or nut/bolt.
You might finish the mounting by applying (Hot-Melt) a bead of RichH’s “P-Tex” (or Polyethylene “Welding Rod”) along the edge of the harware and hull junction.
Some reference reading:
GUIDE TO ROTOMOLDED KAYAK & CANOE REPAIR:
Linear Polyethylene: Repair using heat