We have already talked about the basics of good glue application: apply it in thin coats; clamp it for drying; and allow sufficient drying time. Here are some other pointers to help you in making successful glue joints.
Rough vs. Smooth Glues do not adhere well to very smooth surfaces, but work best when they can grip something. For this reason, you should roughen slightly any smooth surface before applying glue.
For example, a chair rung has pulled out, and you want to glue it back in place. The surface of the rung is probably very smooth. You can make a better glue joint if you roughen the surface of the rung where the glue is to be applied. Try a few passes with coarse sandpaper or scraping a little with the blade of your pocket knife. Then brush on a thin glue coat and reinsert the rung into its hole.
Clamping Techniques Clamping, as we have said pretty often, is essential, but a careless use of clamps can create problems. Always use a pad of some kind
between the clamping surfaces and the face of the wood, so that you do not dent or mar the furniture. Thin little shims of wood make good pads. This advice is especially applicable when using C-clamps.
Cleanup The final joint should be neat and clean. Therefore, after setting the clamps in place, wipe away any excess glue. Watch for any later drips or runs; wipe these off, too. There is absolutely no holding value in glue 011 the outside of a joint. The glue does all of its work on the two butted surfaces within the joint
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