Just a couple of cautions for your plan.

As someone pointed out recently, roving is not for use with epoxy.

Wouldn't one of those $12 polyethylene boxes contain the boiled over acid
and protect the boats' structure?

Roger

http://home.earthlink.net/~derbyrm

"Edward Greeley" wrote in message
...
snip
So what do I plan to do about the problem?
snip
I will secure the new shelf to the hull side with roving, or four
or five plies of wide FG tape, as the original shelf was. I will
probably also use a piece of FG tape and epoxy to secure
the shelf to the stringer regardless of whether the original was glued to
the stringer or not.

Please expand on the comment that roving is not for use with epoxy.
I've not heard this before. Mat, on the other hand, should not be used
with epoxy.

Maybe I'm confused, or maybe I'm using dated information. Checking
http://www.clarkcraft.com/fiberglasscovering.php3 they say that their
roving may be used for either, although it's designed for polyester. Then
again, they mention "Epoxy-Plus" resin which may not be the same stuff as
West or System Three's product.

From Wikipedia:
"In the continuous filament process, after the fiber is drawn, a size is
applied. This size helps protect the fiber as is wound onto a bobbin. The
particular size applied relates to end-use. While some sizes are processing
aids, others make the fiber have an affinity for a certain resin, if the
fiber is to be used in a composite (Lubin, 100). Size is usually added at
0.5 -2.0% by weight. Winding then takes place at around 1000 m/min (Gupta,
544)."

It's the "size" (or sizing") that makes the difference

I would make sure the roving vendor states that it is OK for use with epoxy.

Roger (Don't you find it uses a lot of that expensive glop?)

http://home.earthlink.net/~derbyrm
"mickey" wrote in message
oups.com...
Please expand on the comment that roving is not for use with epoxy.
I've not heard this before. Mat, on the other hand, should not be used
with epoxy.

mickey wrote:
Please expand on the comment that roving is not for use with epoxy.
I've not heard this before. Mat, on the other hand, should not be used
with epoxy.


I think he means mat, not roving. Roving is simply heavy woven cloth.
Mat is random oriented strands wich are most often held in place with a
binder that is not compatible with epoxy.

If you're going to the expense of using epoxy, I don't see the point in
using materials like mat anyway, the main advantage of mat is to build
up thickness for as little as possible cost.

Also, the folks who are planning to encase plywood in epoxy should be
aware that it will still rot, eventually. If you're going to the trouble
of encasing it in roving, and the expense of using epoxy, why not just
mold a tray out of solid fiberglass?

Fair Skies
Doug King