Tape the joints first. Biax tape will be about a 32nd high and is a real
PITA to fair level with the rest of the panel but it is needed for
strength so put up with it. Do your rough fairing before laying the
glass and then skim coat for final fairing. You can make a very good
fairing putty a lot cheaper than the pre-made stuff with equal parts
epoxy resin and microballoons and enough cabosil to get the right
stiffness.
Wet woven cloth is a LOT easier to handle than wet Biax. 45/45 biax is
very unstable and will stretch in length and get narrow as you handle
it. Dry layup byax is a little more stable but you still have to be
careful not to stretch it out of shape.
I used the Tom Sawyer approach and got a bunch of volunteers. One
person mixing resin, two people wetting out and 3 people laying. We did
two layers of DB170 biax and one 6 oz. woven on my 45' hull in 6 hours.
After wetting out on a table made from a couple of sheets of melamine
we rolled the biax on 2" PVC pipe to carry it to the boat. The only
significant increase in cost was a couple of cases of beer when we
finished.
Ron White wrote:
I am helping a friend who is building a 35' motor trawler. It is planked
with marine ply and epoxy glued and it soon need fairing. Are there any
good commercially available epoxy fairing compounds in 5 gallon units? He
is debating weather to fair the hull after the glass is laid or more likely
fairing before and lightly fairing after the glassing.
On the subject of glassing, the designer, Carl Stambaugh, recommended
biaxial tape at the corners and has left skin up to the builder and has
offered several suggestions. I am thinking that maybe a biaxial covering
would be easier for a small crew (2) to handle as compared to woven cloth?
The boat has a 2' wide box keel that among other things, will take most of
the grounding abuse. He is debating on the glass skin with a Kevlar overlay
or just add some roving to the bottom of the box for protection. Any
suggestions would be welcome.
--
Glenn Ashmore
I'm building a 45' cutter in strip/composite. Watch my progress (or lack
there of) at:
http://www.rutuonline.com
Shameless Commercial Division:
http://www.spade-anchor-us.com