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The shelf life of water based metallic paint is generally 3 to 7 years. For ordinary industrial environments, the anti-corrosion validity period of water based metallic paint coatings is usually between 3 and 5 years; for marine environments and highly corrosive climates, the shelf life of the coating may be slightly shorter, generally 2 to 4 years.

Whether metallic water based paint can cover old paint depends on two main factors: the type of old paint (whether it is water-based paint or solvent-based paint) and the surface condition of the old paint. Generally speaking, metallic water based paint can cover old paint, but it must be ensured that the old paint layer is in good condition and has not fallen off, cracked or severely peeled off.

Water-based metallic paint is very suitable for steel materials, especially in terms of anti-corrosion and anti-rust, which can effectively prevent moisture and oxygen from eroding steel. Before use, the surface of steel should be free of rust and oil, and polished smooth before painting.

Water-based metallic paints may change color in high temperature environments, especially under extreme temperature conditions. The causes of discoloration are usually related to the chemical composition of the paint, the color itself, changes in molecular structure when the temperature is too high, and the curing process of the coating.

Acrylic paint is a common type of paint in the automotive industry, which is popular for its ease of use, fast drying speed and high gloss effect. Acrylic paint usually exists in one-component or two-component form. Two-component acrylic paint needs to be mixed with a curing agent for curing to improve its durability and scratch resistance.

Water-based metallic paint usually requires a good adhesion foundation, so the effect of the paint on wood may not be as ideal as on metal surfaces. In particular, the humidity fluctuations and texture changes of wood may affect the stability of the coating.

Depending on the coating requirements and the protection needs of the metal surface, the dry film thickness of water-based metallic paint is usually between 25-80 microns. The recommended coating thickness for most standard products is around 50 microns.

Metallic paints that do not require primers are: 1. Direct-to-Metal Paint (DTM) 2. Alkyd Paint 3. Epoxy Zinc-Rich Paint 4. Polyurethane Paint