Large Scale Central

Glues

General Discussion
#21

I have to agree with you Gary, my results with Goop, as either a glue or contact cement have been disappointing, and it has failed in most applications I have tried, and in just a short time.

I have had it just basically not stick to a surface and let go, yet the literature speaks of it like a miracle glue.

I’ve used “real” weldwood contact cement, the nasty smelling kind with a lot of solvent (not the water based stuff) and it works well but it’s not an outdoor type of glue from my experience.

Greg

#22

I have also found the Goop doesn’t like to stick to small wood pieces, long term, outside. But I also have found that it will hold to wood that is protected from the weather. It’s held my aluminum roof panels, and asphalt shingles, onto the wood sub-roof for many years. Goop also holds to metals and plastics better if the surface is cleaned well and scuffed up a bit. And new, runny goop, tends to work better then the partly dried out, gel like Goop. So Goop isn’t the end all, be all, but it does have its uses.

#23

I have used Liquid Nails (exterior) for wooden structures, bridges, etc,. It’s hard to work with as it skins over quickly, but once bonded to each surface, it’s nearly impossible to pull apart. I have two bridges I built 15 years ago that are outside all the time that have not come apart. I haven’t used it on plastic yet, suspect it might hold as well. Might try that now, as I’m working on some plastic structures that need repair. I also have found E6000 to hold up well too, except in direct sun…seems to dry up and separate. In partial shade or protection okay.

#24

I built my wooden bridges, and trestle, with polyurethane glue. It works well on the laminations, but it has let go one few of the butt joints. I also pinned the joints, and that helps.

#25

I liked liquid nails until they went to the low VOC formula, water clean up crap. Not worth the tube they put it in. Much the same can be said for the non solvent based contact cements or for water based primers for wood. May be good for the environment but not much good for their intended purpose.

#26

Gary, I am so sick of “green” that I could puke. It took me a lot of looking before I came up with a can of Wolmanizer, the copper stuff used to protect wood. Its not “green” in the environmental sense, even though it is green in colour.

#27

Black E-6000 is the Glue to use outdoors… The black pigment helps protect the adhesive from UV damage. My large redwood trestle is glued together with it and it has been outside for over 10 years and is holding up well. What I really like is that if one of the braces get broken I can remove them and peel off the old E-6000 and then easily glue the replacements on. One of the big concerns with the E-6000 is cleaning up the excess that oozes out when you glue together parts. The secret I found is to NOT CLEAN THE PARTS right away. Let the glue dry for at least an hour but not much more than 24 hours. After the glue reaches it initial set the excess is very pliable and can be peeled off by rolling with your thumb or tool. If you wait too long though, the adhesive strengths take over and it is more difficult to remove. Either way is better than smearing the excess around when it is in its liquid state though. The secret to E-6000 is its high elasticity… It stretches with the movement of the materials instead of being rigid and breaking.

Russ Miller

NGRC 2016 Chairman

#28

I’m sure I’m missing something here but, once two parts are glued together how can UV rays effect them? If the two parts are glued face to face, so to speak, how can UV rays penetrate and effect the glue? UV rays could affect any squeeze out or exposed glue, but the actual bond between two surfaces? Just wondering.

-Kevin.

#29

Kevin

I have never seen an invisible glue joint … the sun will find the glue!

#30

Even prolonged solar heat will work at breaking down adhesives, without direct sunlight. In our high desert sun, the only guaranteed method to prevent glue failure, is to provide shade when possible. Only my wooden structures glued with exterior Titebond have held up in direct sun and heat. And as others have said, inside corner bracing always helps.