"Norm II" ) writes:

What exactly is PL Premium...Something I can find at Home Depot?? Thanks.

It's a different formulation of polyurethane (PU) adhesive, a mastic in a
clauking tube often referred to as "liquid nails", used in house
construction. PL Premium is supposed to be their stongest althoug I'm not
sure it's any better than the slightly cheaper PL400. You can find them at
any building material store. I don't shop at Home Depot but they are sure
to stock it. Here in Ottawa I get it for a lower price at Canadian Tire.

David Beede has done some trials with different polyurethane mastics and
put the results on his website at www.simplicityboats.com. I think it's a
good replacement for urea formaldehyde (plastic resin) marine adhesive
(Weldwood was a popular brand). I used plastic resin on my first small
plywood boat (Dogskiff on my website) and PL Premuim on the other three.

PL Premuim is a lot easier to work with. You lay a 1/4" bead on one
surface. I spread that with a putty knife to get it right to the edge and
to get complete and even coverage in the joint. You can reposition the
parts up to 45 minutes. Then clamp (or use screws) and allow 24 hr to
cure. You can even pump it into voids in cheap plywood to fill them. If
the glue gets on your hands it dries flexible and stays for days. If you
don't want dirty-looking hands afterwards, wear gloves.

I don't think you can get a more suitable adhesive at a better price
for a small screw-and-glue boat like the OSS.

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