I recently learned / heard this tip on the 'woodworking' NG . . .after
cleaning the are {HDPE}, 'toast' it {LIGHTLY and CAREFULLY} with a torch,
scuff it, then use a good epoxy.

NOT having the chance to try this . . . YET . . . I can only pass it on.

Regards & Good Luck,
Ron Magen
Backyard Boatshop

"Bray Haven" wrote in message
...
hiya
Im a plastics engineer by trade and yes you are correct almost no glue
will
adhere to HDPE or PP (polypropolene) do you know which one it is ?

When I was an Old Town dealer they had a repair kit for their royalex
canoes
that adhered very well. Know of some that were patched 15 yrs ago & still
holding fine. They had color matched goo in there that stayed put after
you
prepped the area well with abrasive & solvent.
Greg Sefton