For many centuries animal glue , especially hide glue , was the primary adhesive of choice for a great many types of woodworking, including furniture and lutherie. Sometimes referred to as simply wood glue,” polyvinyl has poor heat and moisture resistance, but is the easiest of the synthetic adhesives to use. Just put on a drop of glue and hold the wood in place for 30-60 seconds (again, check the label for that specific glue). I have had to router out a line joining both pieces on the backside of the project and used a length of bamboo placed in the routed line with glue to give it some added strength. By chemical reaction such as two part adhesives with a resin and a hardener or catalyst.
Hot hide glue can be applied by dipping a brush in the glue pot and brushing it onto the workpiece. Hot glue is most commonly applied using a glue gun and comes in low (250°F) and high (380°F) melting options. Alcohol adhesives can be used in appropriate circumstances, but are generally less suitable for the gluing Lalegno floors, because most of our floors are long and wide. When regluing joints, remove as much of the old glue as possible to create a tight joint; new glue does not adhere well to old glue. The best types of varnish to use are epoxy varnishes and polyurethane varnishes.
This adhesive is also indicated for bonding prefinished parquet on porous substrates, as well as onto existing floors such as marble, sandstone, ceramic, marble tiles, etc and can be used for bonding wooden floors on underfloor heating. When it finally polymerizes in a wood joint, enough gel remains for a better bond than with the thin version. For anyone who turns pens the CA glue is ideal for gluing the brass tubes into your blanks before turning.
The use of alcohol reduces curing time and provides better wetting of the wood surface. If you need glue for exterior woodworking projects subject to moisture, humidity, and temperature changes, look into ASTI Type I water resistant and ANSI Type II waterproof wood glues. Heat and humidity in the Houston area is hard to deal with on shelf life especially if you have senior moments and forget to bring the glue inside. The basic problem is the brittle nature of the polymers, which are normally formed when the high-strength adhesives are created. A very common application for epoxy glue is in the craft sector where they are used to bond different types of wood & stone materials.
This is an unconfirmed story, but I have no reason to doubt it. PU mastic sticks all sorts of things like the proverbial ‘suet to a blanket’ (!) and, consequently, is a very useful adhesive for bonding dissimilar materials – wood to GRP, or steel, for example. If you’re initially testing a solvent, make sure that the wood is clear of any small particles of sawdust that might make it appear as though the towel is being discolored.
Note in the example above, mineral spirits was used to lift some of Cocobolo’s oils off the wood surface: and you can clearly see the stained orange cloth as evidence. Depending on the temperature, white glue has a working time of five to 20 minutes and cures in an hour or two. Sika’s wood floor bonding adhesives allow sanding and finishing within 8 – 12 hours.
It must be applied to wood while hot, and forms a strong bond as it cools and loses moisture. Even though you can’t see any glue on the exterior workpiece if it is not properly cleaned and sanded the finish you use may show the hidden glue. Moulding and trim glue is a polyvinyl acetate formula specifically sold for carpenters and woodworkers who need a fast-setting glue that will not run or sag. Epoxy has the advantage of being waterproof and does a good job filling gaps in wood.
It works well for some applications, and sometimes is better than Titebond and other PVA glues on wood as explained below. The above variations represent one category in the yellow wood glue family, but let’s say you are working with a dark wood; a bright yellow glue line would be unsightly. I them coat the whole paddle with 3 coats of West System with 207 hardener followed by 3 to 6 coats of marine varnish (I am partial to Pettit’s Captains varnish).