Model Forum / Radio Controlled / Water Models / October 2007

silicon rubber?

Someone suggested polyurethane glue. If that or epoxy doesn't
work, you're probably not going to find a glue that does.

Polyethylene is about as good as Teflon at shedding glue. (When
they want to glue Teflon to something, they etch one side with an
acid so the glue will bite - not something you want to do at home
even if it would work for polyethylene.)

If your goal is simply to get a watertight passage, you might want
to use one of the fittings they sell for fuel tanks. These compress
a gasket or o-ring against the plastic tank creating a leak-proof seal.

Another alternative that might work is to use an adhesive sealant
to secure a short metal tube through the polyethylene then another
dose of sealant to secure the plastic tube in the metal tube. The
metal tube will prevent the flexible plastic tube from wiggling
and working the seal against the polyethylene loose. Sand every
surface with 120 grit sandpaper and clean thoroughly to ensure
a good seal and some "bite".

-Wm