Hey Keryn,
I used the Daichi 1016's in the melded arrays for my second set of 3 WH8s, and they seem fine. I did notice that the sizing of these is different to the Goldwood 1016's, so you have to adjust cuts accordingly, but the one advantage with these seems to be that you don't end up trimming the screw barrels at all, or, at worst, a tiny little shave.
Wagner online is the retail arm of WES components. Sign up with WES and you'll get a better price as well.
I'm presently building some road cases for lighting, and thought I'd try Bostick's AV515 (basically to see if it might do for building cabs???).
It's polyurethane, and says on the tube it expands slightly while setting.
It does, it bubbles on the squeeze out, and makes your hands black, and cleans up slightly easier than PL with a chisel when cleaning up, and sands away to pretty much unnoticeable in the joints.
You have to work with it pretty quickly I find, so predrill holes and insert screws dry fit, pull screws out, thinish bead and put screws in straight away.
I can't attest to its sealing properties leak wise though.
It's not cheap, but might be worth a try.
Hope you are well and this helps...
Built:
DR 250: x 2 melded array, 2x CD horn, March 2012 plans.
T39's: 4 x 20" KL3010LF , 2 x 28" 3012LF.
WH8: x 6 with melded array wired series/parallel.
Bunter's Audio and Lighting "like"s would be most appreciated...