kollac wrote: ↑
Tue Apr 28, 2020 1:35 pm
calling all vacuum bag surfboard building ninjas - layup process question:
Suppose you want to build a quick prototype of a XPS foam core board because that's the material you have laying around right this moment. If the layup suggestion is 3 x 6oz glass top and bottom (has a stringer) as it was a few pages back - how do you apply those layers? Try to do top AND bottom at once, all layers together and then bag the whole banana? Do top separately from bottom, 3 layers each at a time or some other combination of steps (1 layer on 1 side at a time etc.?). Thanks!
I am decidedly not a vacuum bagging ninja, but tried it a couple times...
If it is your first time, I would definitely recommend doing the top and bottom in separate steps. Your epoxy is going to start curing, while wet fabric is falling off after you flip the board to get the other side of deck, while your vacuum isn’t sealing, while... you get it. Also, rails in vacuum bag are really tricky, especially if doing two sides at once- the bag wants to crease right at the rail and pull the fabric into a knife edge around the board, instead of overlapping. Other people seem to do alright, but mine came out horribly.
I would do two steps: first all layers of top, then all layers of bottom. Allow epoxy to harden, but not fully cure between steps.
Honestly, for my next board I’ll probably trim carbon down to just before the rails, vacuum bag that, and then wrap rails with a layer of fiberglass by hand. Most of it was fun, but I really didn’t enjoy doing the rails...