Frequently Asked Questions
Frequently Asked Questions about using KUDO® product.
I want to paint metal. What do you need for that?
Alkyd enamel is best for painting metal surfaces - compared to acrylic enamel, it has a higher adhesion to metals. But first you need to prepare the surface. If there is rust on the metal, you should grind it with sandpaper, treat with a rust converter, then rinse the converter with water, wipe the surface dry, degrease and start painting. Many alkyd enamels can be applied to metal without primer, but using primer will definitely improve the adhesion and protective properties of the coating. It is not necessary to coat alkyd enamels with varnish to make the coating strong and glossy, because they are strong enough by themselves to form a glossy surface.
I want to paint the plastic. What do you need for that?
The first thing to consider is that not all plastics can be painted. Polyethylene, polypropylene, Teflon and silicone are not paintable. Before painting, the plastic must be cleaned of dirt and degreased. It is not necessary to mat the plastic with sandpaper - this will only spoil the surface. It is better to use acrylic enamel to paint the plastic - it is more elastic and has better adhesion to the plastic. It is allowed to put acrylic enamel on the plastic without primer, but it is better to apply one layer of adhesion activator beforehand. If you want to paint the plastic with alkyd enamel, the use of adhesion activator as a primer is mandatory.
I want to paint wood. What do you need for that?
The wood can be painted with both acrylic and alkyd enamels.
Acrylic enamels can be applied with or without a primer. The reason is that acrylic enamel is a thin layer, and without the primer the wood grain will show through the enamel, creating an additional decorative effect. If an even, smooth surface is desired, the use of a primer is mandatory.
Alkyd enamels should be applied to wood only with a primer, otherwise you will not get an even glossy surface.
A general rule when painting wooden surfaces: after the first coat of any primer, enamel or varnish, the nap rises and the surface becomes rough. Therefore, the first coat should be made thin, let it dry and sand it with fine sandpaper. Then you can apply subsequent coats, so the coating will be smooth.
How long does spray paint dry?
The acrylic spray enamel dries in 10-15 minutes at 20°C. It takes 2 hours to dry completely.
Alkyd enamel dries on the tack in 30-40 minutes at 20°C, full drying takes 5 to 24 hours. However, the chemical processes in alkyd enamel are not finished after drying. After the solvent evaporates, the polymerization process continues in the alkyd enamel under the influence of air oxygen. The molecules "cross-link" each other and, figuratively speaking, form one big molecule, making the coating more durable and resistant to various influences. The polymerization process can take anywhere from a few days to two weeks. During the curing process, the coating should not be subjected to mechanical abuse. For example, an alkyd enamel painted car body element must not be washed or polished within two weeks. Also during curing, alkyd enamel must not be coated with other paintwork materials, even on alkyd basis - the coating can be spoiled. Coating should be done either "wet on wet", i.e. the next coat should be applied immediately after drying "on the rip", or after full polymerization. The wet-on-wet application will result in higher adhesion of the applied layer than the fully cured application.
Are the cans reusable?
The aerosol can may be used multiple times during its shelf life. In order to avoid blockage of the atomizer head at the end of operation, turn the can upside down and spray until the product is no longer flowing. Stop spraying when only gas comes out of the atomizer.
Do I have to remove the old paint before applying new paint?
It is only necessary to remove the old paint coat before applying a new one if it is damaged and does not adhere well to the surface to be painted. If the old coating is firm, it is not necessary to remove it, it is enough to simply sand it down with fine sandpaper, so that it acts as a primer for the new coating.
Decorative metallic enamel ordinary and mirror: what is the difference?
The metallic enamels are non-leafing metallic enamels with high abrasion resistance. Metallic metallics are non-leafing metallic enamels: they give the visual effect of metal spraying, but have a low abrasion resistance.
Silicone or hybrid sealant?
Hybrid sealants are a versatile and balanced solution: they incorporate the best of polyurethane, silicone, acrylic and rubber sealants and adhesives. Their main advantages: they can be applied on a wet surface, have high strength, excellent adhesion, do not yellow, do not emit odor and, most importantly, are excellent against the formation of mold and mildew. But because of their good adhesion and high strength, hybrid sealants will be harder to remove, should the need arise.
Silicone sealants can be acidic or neutral, depending on the curing system. Acidic sealants emit a pungent acetic acid odor when applied, while neutral sealants are virtually odorless. Acidic are used on stainless steel, glass, ceramics, wood, but are not compatible with alkaline materials (cement, lime, plaster), marble, granite, cause corrosion of metals. Neutral can be used without restrictions.
Is it necessary to moisten the PU foam assembly?
Yes. The foam cures with moisture.
How to paint from a spray can.