Pro Bond
 

I've just started using Elmer's Pro Bond on some of the planes I'm building. Is there a trick to putting on the right amount ? I currently try to lay down a very small bead and then brush it out with an acid/epoxy brush. Is there a better way.
Thanks
Z

Pro Bond
 

I have seen a suggestion to use an old credit card to spread it so thin that the surface has only a dull sheen. It apparently expands about 3 to 4 times itself. I just bought the same thing on Thursday and I am starting to experiment with it in preparation for sheeting a balsa covered foam core stab.

Pro Bond
 

zx32tt:
I hope you have an air-conditioned shop.
Pro-bond (polyurethane adhesives in general) reacts with moisture to harden. The reaction rate is also speeded up by temperature. Here in FL, which is almost as hot, & humid as Houston, polyurethane glues set up pretty fast this time of year. I also notice that the polyethylene bottles that the stuff comes in allow some diffusion of water vapor. After a while on the shelf, there's a lining of cured adhesive on the inside of the bottle. Squeeze the bottle, hear the crunch.

I digress. My point is, if you are going to sheet a foam-cored airfoil, store the components in an air-conditioned area so you will have adequate working time. If everything is pre-heated and clammy, you may not get it assembled before it begins to cure.