What i would do is first apply the first layer of epoxy on the hull 160 gram m2 (this includes the area on the surface and the top and bottom gluing to stick the planks together).
No, the glue is not included!
The second and third layer are applied with 120 x 2 = 240 gram m2 which will be applied consecutively.
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epoxy wetting for glass 340 x 20% = 408 gram m2
So i would need to apply 400 + 408 gram m2 = 808 gram per m2
NO.
Lets start again. That way I can hidden correct the mistake I made......
First you hammer the junk together, the glue used here was not part of my estimation.
Now you have to apply the glass sheathing. I assumed that the glass is 340 gram m²
In general the weight of the resin you need to wet it out, is about equal to glass weight. But in homebuilding rarely a 50/50 layup is achieved.
We therefore add 10 - 20% resin weight. Resin only!
thats 340 + 374 in the better case or 340 + 408 in the worst. Pick your poison.
But before we apply the glass, we have to saturate the wood! Otherwise the dry wood "sucks" out your glass layup.
And here I made the mistake. I looked for my calculations on varnished surface where you would need 3 coats of neat Ep to close the cavities.
We do not need three coats, two are fine, because we cover the surface with glass.
Now:
1 coat neat ep at 160gsm
1 coat at 120gsm (of course the second coat is not sucked in as the first will be)
= 280 gsm
then 340 gsm glass wetted out by say 400 gram resin = 740 gsm
followed by
2 coats resin at about 120 gsm each.
=240 gsm
total = 1260 gram m²
Thats it
very nicely done apex 