: Hi Malcolm,

: Well it's harder than that. Depends on the skill of the person
: doing the epoxy. The ideal for wet layup (what we do) is 50% of
: the weight of the cloth in epoxy, so for 6 ounce for example the
: ideal would be 3 ounces of resin. Most can't achieve that
: without a dry layup which isn't desireable, the best most can
: hope for is 75% and the average is likely more like 100%. When I
: do weight estimates for boats and for epoxy use I use 100% and
: hope I'm wrong :)

: If you were going to vacuum bag the layup you might get closer to
: the real ideal of about 33%. Only way to know how you do is to
: try it and weigh it. Will need a pretty sensitive scale to tell.

: Btw, those weights are for a square yard, only fiberglass mat is
: weighed by the square foot.

: Bill H.

Hello Bill,

Thanks for that. That's much better than my scale, which is to try to remember how much resin I used for the last build of similar size, and figure the weight for that! You know, I have often wanted to try the vaccum (vacuum? Vaccuum? vaccume?... ) "suction" bagging. I honestly never understood how the resin keeps from getting sucked up into the pump, and never had the money for all the what-nots you need to do it. I have a hot-rod VW that pulls a heck of a vac on the dellortos. Maybe I can just hook it up to that, LOL!

I'm honestly rather shocked that the resing weighs less than the cloth. I thought it would be the other way around. That's good to know. Maybe I will come in under target then.