downunder wrote:BWD wrote:@downunder:
I suspect he meant "heat" as in heat the resin used for laminating topsheet, to get lower viscosity, so bubbles escape and are easy to move around/out of laminate.... ?
The WS is quite low viscosity 1:3 by volume. 1:3.5 by weight.
Heating 100-120g of epoxy doesn't mean much in practice me thinks based on my experience with a topsheets and vac. It might work better with a press, centrally applying pressure, slowly to the rails, heating under bladder. Again in theory and difficult in practise.
The problem with a topsheet, unlike a FG, is the bubbles can't escape when rolling it. And a concave does not make it easier. A slight topsheet lifting up will make a huge bubble and leaving it for latter will make the things worse.
More and more I think a resin infusion is a go. But, how on earth can one do it under the topsheet is unknown to me.
OR, as discussed elsewhere, a tiny holes in a core to act as a perforated film and vac it as usual? But than, would more epoxy than needed leak out under the topsheet (and ss inserts) to the above layers? Duno.
Yeah heating the resin to minimize bubbles. Also Vac Bagging with resin infusion would work too. A Friend is making a foil at the moment using this method and his results are stunning!