"Mac writes:
As I understand it, the issue is not whether polyester resin is strong
enough, but whether new polyester will bond well to already cured
polyester.

Bingo!

Polyester is a lousy glue which is why it doesn't make a good repair
material.

It works well for laying up something new, but not later as a repair
material.


--
Lew

S/A: Challenge, The Bullet Proof Boat, (Under Construction in the Southland)
Visit: http://home.earthlink.net/~lewhodgett for Pictures

"Lew Hodgett" ) writes:

It works well for laying up something new, but not later as a repair
material.

that wouild come under "urban boatbuilding myth" no doubt started by
purveyors of epoxy resin.

I've made polyester repairs to polyester racing hulls - no problem. These
were club-owned boats which took quite a beating. The club had an
unofficial rule "no contact, no protest", nobody wanting to spend their
Sunday afternoons on a protest committee hearing protests, which is why so
many boats required so many repairs. We also didn't like spending weekday
evenings doing fibregalss repairs. There must have been a tradeoff there
somehwere.

I can show you a video on boat maintenance and repair available from the
Ottawa public library which shows step-by-step how to repair structural
damage to fibreglass powerboat hulls using polyester resin and fibreglass.



--
------------------------------------------------------------------------------
William R Watt National Capital FreeNet Ottawa's free community network
homepage: www.ncf.ca/~ag384/top.htm
warning: non-FreeNet email must have "notspam" in subject or it's returned