Glue is that stuff you see in a conical jar with a brush stuck in the top and a big label with the words ‘GLUE’ on the outside. I designed a big truss rod option specially for having less surface to glue, just 15mm sectors on the borders operation takes 15 minutes, and 6 grames of cianocrylate, it glues it mint, putting a good quantity of glue because it dries so fast that if bit glue, no time for pressing, but leaving a good hand of cianocrylate,,i press fretboard exactly 10 minutes and after that it is virtually impossible remove without cutting with a band saw.
I laminated pine to get the thickness to cut the curved backs and when i cut my curves ugly brown lines were exposed, i was too far into the project to redo so i had to live with the mistake and learn from it. i bought the stuff because it was supposed to be the ultimate glue and it was on sale at the time so i went with it thinking that it couldn’t hurt to go with the best.
This glue has been making a resurgence in some traditional woodworking circles because it has a lot of desirable properties: it’s non-toxic, it can be stained, it has strong initial tack that can be achieved via a rub joint (rub two coated pieces together and they will stay together), and it is available in several gram strengths (higher gram strength equals stronger glue joint) and color grades.
Decisive advances in adhesives technology, however, awaited the 20th century, during which time natural adhesives were improved and many synthetics came out of the laboratory to replace natural adhesives in the marketplace. The properties of this glue are, extremely waterproof, very strong strength, quite expensive, slow setting, leaves a dark glue line, good gap filler. This is because the wood’s oils will tend to migrate back to the surface of the wood where you removed some of the oils. Adhesives in this class become active and cure when exposed to radiation, usually ultra-violet (UV) light.
Polyurethane glue is one of the best waterproof glues available, but until recently was not available outside professional circles. Two-part epoxy adhesives start to react under ambient conditions once the two components have been mixed together and are often termed room-temperature (RT) curing adhesives because of this. After application and contact with wood – usually in cramps – time depends on temperature. Polyurethane Adhesive (PU glue) is created from a reaction between isocyanate and alcohol.
If I’m out of liquid hide glue, and need glue quickly, I’ll get a bottle of PVA glue at the local home center. This tough glue is also resistant to rain/weather, UV light, and heat, and adheres well to a wide range of substrates. Two such coated surfaces will bond immediately, in the case of rubber-based contact adhesives. 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).
Substances known as natural gums, which are extracted from their natural sources, also are used as adhesives. Between different types of wood, and even within the same species of wood, there can be a lot of variability in oil/resin content, and gluing success/difficulty. The penetration into the wood is essentially the same if proper thinning is accomplished. Sanding helps to break up this flattened/polished surface so more glue can penetrate into the wood. So at least for me, the deciding factor may just come down to the color of the glue line.
Given these quick-setting properties, always have all pieces and parts at hand before applying the glue. I do a lot of small veneer projects, and have always used a cold set veneer glue (Better Bond). Splashes and joint oozing need to be cleaned up quickly with water but the dark glue line remains when it has cured – it can be sanded off though. While epoxies can be formulated to suit many applications, they are generally very hard, durable adhesives that bond to many substrates successfully in more extreme environments. Epoxy adhesives consist of a resin and a hardener that are mixed together just prior to use.
Almost all of the reactive, chemically curing, high-strength adhesives suffer from some combination of low peel strength, impact, or environmental resistance. It’s a bit harder to find than PVA glue, but it can be ordered over the internet fairly easily, and the fact that I don’t have to worry about small bits of dried hide glue interfering with finishes gives liquid hide glue an advantage that no other glue can touch. Gorilla Glue does not rely on the pores to bond and makes a pretty strong joint as does epoxy. Silicones are not very strong adhesives but are known for their flexibility and high temperature resistance. Generally specific types of acrylics, epoxies and silicones can fall into this class.
Melamine glue is rarely used alone, but must be combined with urea to increase moisture resistance. But after you glue up your project, bits of dried PVA glue can interfere with your finish if you’re not careful to get rid of all of it. I backed into some glue squeeze out and ruined my brand new Virginia Tech Cow Tipping Team” T-shirt. CA glue, or super glue, is well known as a glue to use to join hard pieces together.
You’ll also find solvent-free adhesives, interior and exterior quality adhesives, stain-free adhesives, epoxy and polyurethane adhesives, latex adhesives, and asphalt-based adhesives. A 9% maximum and 7% optimum is recommended and all stock within one press load should be with + 1%. A 5% minimum is necessary to prevent premature glue line dryout. Because of the different possible substrates and combinations of substrates, and because adhesives are subject to such a range of environmental conditions, it is no wonder that there are so many types of adhesives on the market. There is A bowyer who has had similar problems with oily woods when using this glue and manage to repair them.
The value of kilowatt minute must be divided by the kilowatt rating of the generator to give the approximate time required to cure the glue lines in the work load. Hot hide glue can be applied by dipping a brush in the glue pot and brushing it onto the workpiece. This keeps the glue young and supple… just don’t forget to pour the solvent off before using the glue!
CA glue can be used as a temporary way of joining two pieces of wood together as a temporary step in making a project. If you don’t want to invest in a double boiler, there are some manufacturers like Old Brown Glue and Tite-Bond that sell a liquid hide glue that can be used at room temperature, has most of the same properties of hot hide glue, and has a longer open (working) time. There are many urethane adhesives on the market today with Bostiks currently the market leader. In general, more than one of these mechanisms play a role in achieving the desired level of adhesion for various types of adhesive and adherend.
Depending on the temperature, white glue has a working time of five to 20 minutes and cures in an hour or two. Typically used for bonding wood, ceramics, and all types of masonry materials and ceramic tiles. SikaBond-T55 is a one-component, low-VO C, permanently elastic, crack bridging, super strong polyurethane adhesive for full surface bonding of wood flooring and ceramic tiles. Adhesives based on synthetic resins and rubbers excel in versatility and performance.
The polymers used in synthetic adhesives fall into two general categories—thermoplastics and thermosets Thermoplastics provide strong, durable adhesion at normal temperatures, and they can be softened for application by heating without undergoing degradation. The product is typically used to fill gaps & cracks in most metals, ceramic, wood or rigid plastics. Even though glue joints can be as strong as the wood, for outdoor applications gluing AND screwing is often the best way to go. This type of glue is readily available from your aircraft supply company and can be used with success.