Epoxy putty
Epoxy putty is the type of putty that uses epoxy resin as the main material. The epoxy resin is mixed with bulking agent as the main components of the putty. The bulking agent is a material with no (very small) shrinkage that functions as the ”filling material," while the epoxy functions as the binder that keeps the bulking agent to coalesce and hard. Some other material: solvent, additive, and pigment are added to the mixture to give the specific properties of the putty.
The character of the putty is mainly determined by the properties of the epoxy resin. It is a two-component material that is fast-drying, hard, and strong with good sanding properties after he completely dries. Epoxy resin gives a thermoplastic layer that is strong, hard, and has very small shrinkage. The epoxy has high resistance to the solvent, thinner, and heat. The putty can be layered with any finishing material such as nc, water-based, ac, pu, and even polyester or uv coating after it completely dries.
The epoxy putty is a very good material to fix the hole, dent, gap, or crack to make the even and flat surfaces. As putty he is very stable, after he won't shrinkage by application of finishing material, stain, coating, or thinner on it. Some people use the epoxy putty to fill the pores and grain to make the close pores finish. It has very good filling properties that help to fill and close the pores and grain quickly.
While the disadvantage of this putty is that he cannot absorb stains that are applied. Any stain applied to the putty won’t attach to the epoxy surface. It will lead to a color problem, especially for the wood finish with transparent color. The putty also does not have color choices; the putty is commonly available in the market with gray or white color. We may add some pigment to the putty to colorize the putty, but the color result is very limited. The white pigment color of the putty prevents getting the bright and clear color. Any tinting will give the muddy and cloudy color. The pigment addition is also limited; too much pigment in the mixture will reduce the strength of the putty. Too much pigment in the mix could lead to the crack or adhesion problem to the finish.
At the wood color finish (transparent finish), the epoxy putty on the wood will leave a white or gray, which obviously looked at the final finish. We can touch up with glaze or stain to cover the white color of the putty, but it will take a long time and be a difficult process. Then the uses of the epoxy putty for the transparent wood finish must be considered carefully. Make sure it doesn't ruin and affect the final color finish.
Wuud putty application
Epoxy putty is more suitable to be used for the finishing process of wood with solid colors (paint finish). In the paint finish, the color of the putty won’t be a problem since it will be blocked and covered by the base coat or the paint applied on. The epoxy putty is also a good choice to fix the metal, resin, or aluminum because they are usually finished with paint color.
Here are some tips in the application of the epoxy putty
- Consider the final finish color and look.
The putty is applied to get a better look at the final finishing. Make sure the putty fits the final color finish. The epoxy putty is more suitable for the solid color finish. The epoxy putty for the finishing with transparent wood finish must be done carefully to make sure the putty will not ruin the color and look of the final finishing color.
- The surface cleaning.
To get the strong adhesion between the putty and the substrate, then the gap, dent, or hole must be well cleaned. Any dirt, such as oil, dust, or other material in the gap, could interfere with the attachment of putty to the substrates. Blow the dent, hole or gap with air pressure to clean the dust or dirt inside. If necessary, we can use a knife to open and enlarge the small hole or gap to make sure we can well apply the putty.
- Application of the putty.
Epoxy putty is composed of two materials, the putty and hardener. Both components must be well mixed with the proper formula to get the strong and hard dry putty. Make sure we follow the recommended ratio according to the technical data sheet. If necessary, we can add some thinner to thin the mixture.
Insert the putty into the crack or gap with a spatula or knife; make sure the putty fills in the gap completely; then scrape the protrude putty to level the surface. Try to get the level surface when putty is the paste form. The dried putty will be hard and can only be leveled by the sanding process, which is tough work.
- Cleaning the excess
Make sure the putty is only left inside the hole. The excess putty on the surface will ruin the finish appearance or result in the uneven surfaces. We must try to clean up and even the putty during the application when the putty is still wet because it will be easier done. But after the putty is dry, we still need to sand to clean up the putty and get an even surface. Make sure the putty is already completely dry and do a good sanding to clean the putty and get an even surface. Sanding the putty is very important because the epoxy putty is a two-component material that will be hard and insoluble after it dries. We need to use fine sandpaper to remove the sanding mark at the surface. Uneven surfaces or sand marks may appear on the final surface finishing.
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