Ewan Scott wrote:

Two pack fillers are NOT waterproof which is why car bodies repaires
with filler end up with rust around the edges just before the filing
falls out :-)

Some may not be, some I think are. The one I used specifies boat
repairs as one of its jobs and was sold to me on recommendation by a
specialist fibreglass boat builder. Mileage varies...

Pete.
--
Peter Clinch University of Dundee
Tel 44 1382 660111 ext. 33637 Medical Physics, Ninewells Hospital
Fax 44 1382 640177 Dundee DD1 9SY Scotland UK
net http://www.dundee.ac.uk/~pjclinch/