I’m drilling some holes through cored deck for a front Armstrong dive ladder mount. I over-drilled and picked out core foam for ½ inch around the bolt holes as usual.
I’ve always used MarineTex as my thickened epoxy to build the ‘plug’. I have some Six10 thickened epoxy adhesive cartridges, and I called Geourgeon Brothers Inc tech support and spoke to Greg at 866 937 8797 to see if it could be used as the ‘plug’ epoxy, with the advantage of self-mixing, no waste, ‘point and shoot’ accuracy.
He said ‘absolutely, that’s what it’s for’. Some even pump it into a syringe for tiny application lines.
I have had past issues with 100MPH tape and blue tape on the underside failing to hold the epoxy mix. This time I put a small square of alumimum foil over a same size bolt and partially screwed it into the bottom layer of glass. The epoxy will seize onto the foil, not the bolt, which I can un-screw, and drill through the remaining foil for the final bolt-through.
I used a tube of Six10 last opened in Jan 2016, 2015 vintage, and it worked great. The only epoxy tube plug saver that’s ever worked in my experience. Consistency of honey, 42 min set-up time.
I see no record on the site of anyone else using SixTen for over-drill core replacement plug purposes. I say it seems to work great, it’s very neat with no mess, no mixing, no fuss, and it’s the ONLY epoxy other than JB Weld that has a good plug for next-time use that actually works. The only downside I see is it’s more expensive than the gallon mix-it yourself and add colloid options. Even we are on a ‘fixed income’ but SixTen is well worth it for small jobs like making a core plug for a through-deck fastener. As always, your mileage may differ.
I am offering this only because, as far as I can tell, no one else has. Several years ago I asked Bob about it, and he said he personally had no experience with it, and generously offered me some free epoxy and cabosil filler, along with his advice that MarineTex was another thickened epoxy that could do this job. But what a mess trying to get it to go down a small hole and completely fill it!
Consider Six10 for your next core foam fastener plug!
Call ‘em if any questions, fast, courteous, US based tech support!
(How common is that?)
Cheers!
John