Hello Stephen, Many years ago I used urethane can foam that you can purchase from the big home improvement box stores. Its the same foam that is used to seal around electric outlets or wherever you have crack leaks in your home walls or water lines passing through walls.
Be aware that they also sell a water-base latex type expandable foam in a can. The water-base latex type isn't nearly as good for gluing your foam pieces together, I doubt it will hold strongly together if at all. Make sure you get the Urethane type. When I glued pieces together with the urethane foam they were usually 3/16 or 1/4” thick pieces of Klegicel type foam. I ran a small bead down the edge of one piece, of course it instantly starts expanding, I then push the two pieces together, that kills the expansion while smasing it, then sorta rub them together in shear action, then spread them apart, that also helps kill the expansion and leaves the gooey urethane chemical showing on both pieces of foam then push them back together. I typically had plastic on my table top where the glue seam would be on it. I laid some kind of weight on both pieces to hold them in place until the glue was dry. You will see some places along that seam where expanding foam is rising out of that seam. Just use a paint stir stick or something to keep those places scraped off. Doesn't take long for that to stop. Once its dry, if there are any places where there is expanded foam bubbles sticking up above the surface just cut, scrape or sand it off. I could take those glued together pieces and bow them over the top of a four place homebuilt as though it was a continual large piece of foam. The glued seam didn't cause a kink or funky spot at all. I put some pretty good bows in pieces to test them out. Never had one break apart. It really is a very strong seam. MDon't try bowing the green or tan KR wing foam. Im pretty sure it will break apart if you tried bowing it. I am not positive if it is but the original Gorilla Glue looks and acts like urethane foam chemical. Ive used a lot of the two part expandable foam over the years, I havnt figured out how both part A and part B are in the same Gorilla Glue bottle. 🤔 It will produce expandable foam bubbles just like the canned Urethane Foam. I will bet the Gorilla Glue works the same but I have never tried it before like my technique above.l If you use the cans of expandable urethane dont forget to press together, smear/move around the two pieces of foam on the urethane bead or beads you spray onto one piece of the two pieces to be adjoined together, separate them then smash back together and hold in place until cured. Try two pieces of scrap foam and you will see what I mean. Larry H > Teate, Stephen via KRnet <[email protected]> wrote: > > All, > Some time ago there was a discussion about gluing pieces of foam together to > make a larger block that can then be sanded. For years I used the biggest > blocks I could find and used spots of five minute epoxy to join them > together. Then just hoped I didn't hit a glue spot. It worked but only > because I couldn't figure out a better way of doing it. > > In the last issue of Kitplanes there is an article on doing this with Gorilla > Glue and Sherwin Williams Shrink Free Spackle. I am starting on my new bottom > cowl this weekend and really needed something like this. I did a quick test > and will say that it works wonderfully. But for whatever reason they didn't > show a photo of the materials. There are multiple kinds of Gorilla glue and I > didn't know how many types of spackle there was so I have attached a photo of > what I used and as I said it worked great. > > The glue came in a 4 oz round bottle, is brown, and is labled as "original". > The spackle comes in several sizes from half pint, pint, quart and gallon. > You mix approximately twice as much glue to the spackle. I did not measure it > I went with close enough. I mixed it for a few seconds in a paper 3 oz Dixie > drinking cup until it reached a consistent color and spread it where I wanted > it. Apply your clamping force and let it cure. The cure is based on > temperature but a few hours in the low 60's was enough for me. The mixture > will expand a little so if you are trying to fill a void it will do that. I > would not say that it was excessive or forceful. After cure I couldn't > separate the foam without destroying it. The seam cut, sanded, and filed just > as if it wasn't there. I did not hot wire it but would expect that to work > too. > > > Stephen Teate > Paradise, Texas > > > > The information in this email is confidential and may be legally privileged. > If you are not an intended recipient, you should delete this message. > Access to this email by anyone else is unauthorized, and any disclosure, > copying, distribution or action taken or omitted in reliance on it is > prohibited > and may be unlawful. > <KR FOAM - Small.JPG> > _______________________________________________ _______________________________________________ Search the KRnet Archives at https://www.mail-archive.com/[email protected]/. Please see LIST RULES and KRnet info at http://www.krnet.org/info.html. see http://list.krnet.org/mailman/listinfo/krnet_list.krnet.org to change options. To UNsubscribe from KRnet, send a message to [email protected]
