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1st October 2015, 10:05 PM #1
Polyurethane glue under NC Lacquer
Its been a while since I have done much woodworking, but I have been asked to build a smallish table.
The only fresh glue I have is some polyurethane glue, I have never used this type of glue for furniture joints before.
I did a mock-up of one of the leg and rail joints this afternoon and glued it to test how it will look. There is glue foaming up and spewing out of the joint.
I am a bit worried that the glue might show up under the finish when I spray the NC Lacquer.
The legs are Blackbean, so it has an open grain that will hold a bit of glue, I don't think I will be able to sand it all off.
Can anyone tell me if they have used this glue before with a NC Lac finish, and were there any problems.
Or should I look at other options, e.g.. polyurethane finish.Brad.
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1st October 2015, 10:28 PM #2Taking a break
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We use PU glue all the time at work for furniture.
Masking up the end of the rail and the leg around where the rail will be with tape helps a lot with the mess. You'll also find that there's a "sweet spot" during the curing of the glue where the foam is stiff, but not fully hardened. If you peel the masking tape off during this time, the foam will come away from the join easily and almost totally cleanly and any leftovers can be removed with a sharp chisel. Once it's fully set, a light sand should be all that's needed to clean up any remaining dark patches.
Once PU sets it's non-reactive and you should be able to use any finish you like.
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2nd October 2015, 07:55 AM #3
Thanks for that reply. When I do the final glue-up I will take your advice and tape around the joints.
I will try to clean up the excess foam off my test joint later and probably will put some NC Lac on to test if the glue is visible.Brad.
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