In the glue section of DIY stores, it is sometimes difficult to navigate. There are both very specific types of glue and glues that stick to almost anything and in almost all situations. Here are some elements that will help you make your choice.
To choose the right glue, you must ask yourself some preliminary questions. They relate, first of all, to the nature of the materials to be bonded. The operation can involve one or two materials of different types. These materials can also be absorbent or not. It is then necessary to wonder about the application in itself. The materials to be bonded may indeed have to support a load or be exposed to heat or humidity.
Note that whatever type of glue is chosen, care must be taken to ensure that the materials to be glued are very clean, otherwise the grip could be compromised. It will also be necessary to respect the drying time. Otherwise, the bonded surfaces may not adhere well. Finally, while it is often advisable to do too much rather than enough, this is not quite the case with glue. Indeed, applying too much glue lengthens the drying time and can even jeopardize its adhesion qualities.
Contact adhesives and reactive adhesives
In the glue jungle, there are in fact two main categories: contact adhesives and reactive adhesives. Contact adhesives correspond to physical adhesives. They are recommended for bonding porous materials. Because these glues contain water or solvents which evaporate or penetrate the support to leave the adhesive alone to set.
In the case of contact adhesives, it is, therefore, necessary to apply a thin layer to the two surfaces to be bonded and then wait for the adhesive to dry. Then you have to join the parts and exert strong pressure on the whole. The contact adhesive then remains elastic, but the bonding is instantaneous and definitive.
Contact adhesives can be used to glue paper, wood, leather, textiles, rubber, etc. It is possible to make natural contact adhesive easily at home. All you need is a little flour, water, and sugar. Pour a glass of flour, two glasses of water and two tablespoons of sugar in a saucepan. Then heat over low heat, stirring the mixture until you get a consistent paste. This flour glue will keep for at least two to three days. If the flour glue is too thick, add water. Conversely, if it is too liquid, add a little flour. The same technique can be used to make glue from milk, rice, wheat, tree resin, etc.
Reactive adhesives correspond to chemically setting adhesives. Overall, they are used with non-porous materials. And when the assemblies are called upon to resist loads and/or difficult conditions. Note that reactive glues can only be applied to one of the surfaces to be joined.
Besides glue, a liquid plastic welding tool like Bondic can also be used to fix the broken pieces. Read these Bondic welder reviews to know more about this UV light welder.
Choose your glue according to the use
Thus epoxy glues are perfect reactive glues for bonding metals and many other materials. They withstand both heavy loads and a wide range of temperatures – between -30 ° C and +100 ° C without any problem. They are also resistant to humidity and are therefore suitable for both indoor and outdoor bonding. Epoxy adhesives are compatible with metal, wood, glass, porcelain, tiles, terracotta, and rigid plastics. However, they are not recommended for polypropylene, PVC, expanded plastics such as polystyrene or polyurethane, and fine fabrics.
Vinyl glue – sometimes known as white glue – is primarily used to glue wood. You should know that it is not resistant to humidity.
Neoprene glue is a contact glue that should not be used outdoors. It is not suitable for gluing polystyrene or flexible PVC, for example. And it tends to turn yellow over time.
Polymeric glues are the most versatile. They are suitable for indoor or outdoor use and for almost any material. They can be painted after drying. Just like acrylic glue, which still requires at least one of the surfaces to be glued to be porous.
Polyurethane adhesives allow for the joining of porous materials such as wood or foams. They set quickly and are resistant to heat and water.
The cyanoacrylate adhesives – more known as super glue – finally, are used for precision collages – in watch or DIY, for example – and whatever materials – aluminum, rubber, porcelain, ceramic, etc.
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