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Mark _australia said..
Overner
Like everyone else I wet out on a table then transfer the glass to the board, there is no excess resin. When that glass is used to bond corecell to the EPS, it is sufficient to make a board that lasts. The micro areas of no bond seem to not matter if people are jumping it hard for a few seasons with no issue. So I ask - why would you fill? instead of your question why not fill....?
I see the argument with stuff like end grain balsa but part of the problem is then it sucks resin from the filler and you can end up with a powdery weak fill sometimes. As Hoops says its gotta be done in the same step - not fill and sand and then bond if you can avoid it.
The sealing blanks thing on Swaylocks seems to me that it came from people who only every wet out glass over PU, then suddenly had EPS drinking up resin. Good glassing technique minimises that, or as we said wet out on table but surfboard guys were largely unaware of that 20yrs ago (and if you're making a lot of them it would be a nightmare to have a wetout table). Smearing wall filler on a blank is crazy talk yet it became popular. I agree the 3D glassing thing was just a way for them to sell their mistake lol
I think Mark Oz and Overner have valid points here. Weather you fill or not depends on the method you're using and what you're trying to achieve.
You don't even need to fill the whole board. I'll often screed areas where I think there could be an adhesion issue or an area that cops a bit of a beating. The rest will just be the resin in the pre wetted glass will be enough to adhere.
Or you could just smear the whole thing in 6 Ten. But please stretch your back first if you choose this method.
Cheers, Hoops