downunder wrote:Thanks skri
Than 'hot coat' the board with thinned epoxy using a PX ( xylene). Mix PX 10% with hardener only, not with a resin. I use a disposable foam brush.
Also, it is imperative to glass the bottom asap after taking it out from a bag. Trust me on that.
Up to 10% (or more, test your epoxy, I do 15-20%), for a total amount of mixed resin and hardener ( ie. the amount with no PX), thinning the hardener first. Than mix everything as you would. And work fast. Do not overwork with a brush. This is almost an art.
It might twist and distort or completely loose the concave (or make it heaps bigger). It all depends on humidity/temp.
Hope this helps.
The epoxy wrinkels, casued by wrinkled vacuumbag, are removed when pulling of the peel ply.downunder wrote: huh, this might produce epoxy wrinkles on every wrinkled bag spot, unfortunately (I think).
See, the vac bag wrinkles are not a problem at all, in fact, we need to use heaps of excess vac bag for the bridging (ie step down in a board, like rails, etc). BUT, for that you need to use ble+bre+peel ply and the board will end up perfect. A bag with no wrinkles is not a good vac baging technique, btw.
Great tip on hot coating the top using PX. I also have a nylon topsheet laying around, but this might be a bit excessive for this build.downunder wrote: Than 'hot coat' the board with thinned epoxy using a PX ( xylene). Mix PX 10% with hardener only, not with a resin. I use a disposable foam brush.
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