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The waterproof effect of polyurethane waterproof paint is closely related to the number of layers applied. In building construction, it is usually recommended to apply 2 to 3 layers of polyurethane waterproof paint to ensure that the coating thickness is uniform and dense to achieve the best waterproof effect.

The drying time of polyurethane waterproof paint is divided into three parts: surface drying time (4 to 8 hours), actual drying time (24 to 48 hours), and complete curing time (7 days).

The quality of the paint directly affects the waterproof effect. High-quality waterproof paints usually use high-quality raw materials and advanced production processes, and have strong waterproof, corrosion and wear resistance.

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.

Polyurethane waterproof paint has high elasticity and ductility, which can effectively resist deformation caused by tiny cracks, settlement or thermal expansion and contraction on the surface of buildings. It can stretch or shrink with the movement of the substrate surface, avoiding water penetration through cracks.

Polyurethane waterproof coating is a highly efficient waterproof material, which is highly respected in the market for its excellent elasticity and waterproof performance. This coating usually exists in liquid form, and when used, it is evenly applied to the wall or floor of the shower room by brushing or rolling.

The types of polyurethane waterproof coating are: 1. Single-component polyurethane waterproof paint 2. Two-component polyurethane waterproof paint 3. Oil-based polyurethane waterproof paint 4. Water-based polyurethane waterproof paint 5. Modified polyurethane waterproof paint

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.