Way back when, in the WMD Compsand thread, Greg Leohr explained how he attached cloth to veneers with Super 77 before bagging. So I assume there is no compatibilty issues with RR epoxy.
What I’m thinking of doing is bagging a laminate, but I wanted some (deck) layers inlaid (cut to a bottom cutlap) and some layers to wrap the rails. So I was thinking maybe I could lightly spray 77 on the blank and set the cloth, cut it and then laminate with another layer that wraps the rail and then throw it in the bag.
Is the 77 going to cause any adhesion issues?
However, if my addled memory serves me correctly I think Resinhead said 77 melts EPS? There was another product that wouldn’t?
Resinhead, you there? Oh, and could you supply a dose of smart ass humor with your reply please?
The information I've seen says 77 will cavitate EPS foam.
Kokua mentioned something about using Clearco 444 for foam a while back.
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Super 77 will definitely eat foam if you spray it directly on the foam. However, Greg was spraying it on the veneer and sticking the glass to it and trimming it. As long as the adhesive is set up, it shouldn't eat EPS.
If you can get these they will work. Elmers is the cheapest. A while back I ran into Carvenalu (Blane) and he asked about using these glues to hold Carbon Fiber onto his shaped blanks for glassing. He was tacking the carbon down then wetting it out to avoid bagging the lams.
I’ve done exactly what you are asking about with the Elmers glue. I tack material onto the blank to hold it in place and cut out the inlay I want, then place fiberglass over the material and wet it out. It’s a one step inlay. The cleaner your cut on the material the easier it is, no pinlines if you do it really clean.
I just read the thread....walked out to the workshop and sprayed two normal coats of 3M Super 77 onto a scrap of 1.75 EPS. Nothing happened. So I Flipped over the scrap and sprayed for 3 seconds holding the can about 6" from the foam. Nothing happened...just a big blob of glue...It's almost midnight...I'll look at the foam in the morning and let you know if anything weird happens........
The thought of spraying the cloth occured to me but I have such limited space. And then flipping the cloth…I have vision of it folding in on itself, you know like masking tape, getting all stuck. Sounds like a two man job. Blank on the stands and light spray sounds easier. I’m not concerned about clarity because I’m planning on using innegra (rather opaque to begin with), I just don’t want to compromise the structural integrity…
Maybe I’ll see what Stingray’s test shows…
Oh, I guess I have to say something foolish to get some of your classic sarcasm (which is very humorous to me). Let’s try-mmmm can’t 3M make adhesive without VOCs?
Super 77 is something that every craftsman should have in his tool chest. It boggles the mind how many uses it has, and ever since Mcgiver bought a can, he’s given up chewing bubble-gum.
Jeff, I used a light spray when I tacked the material on. Mostly down the middle to hold it in place. I do this because I’m trying to keep the number of things I have to do down to a minimum. The normal way seems harder because you have to cut the material along the lap line then go back and add more glass later. At least Stingray showed us a really good way up taping the lap to make it easier to cut a nice clean line, but that’s a lot of taping and you still have to do the clear glass over the cloth inlay.
I recently did a board with nose and tail blocks, and didn’t shape those parts of the board till after they were added so I could do that just one time. My latest board has sharpie pen pin lines free hand. Looks really bad up close, looks bad from far away, but it took 2 minutes to do. What can I say, I’m a hack. A can of spray paint can hide it if I want to later.
The spray test is a must if you already have the glue and don’t know if it’s OK to use. I just shaped a XPS blank that looked so much like PU. I took a piece of the rail cut and put some UV PU resin to see what would happen. Sure enough the resin melted the foam. The UV cure was really fast, but you can see that the foam started melting a little.
The biggest problem with 77 is the way it makes the hairs on your arm feel after laying down a barage of it. The celia in your lungs would feel that way if they had nerve endings. Use both a fan and a mask.
