Rust-Oleum 4900 Heavy-Duty PU Varnish is a clear, 2-component, water-based polyurethane varnish that delivers exceptional durability and chemical resistance for both interior and exterior surfaces. Available in matt or gloss finishes, it resists boiling water, alcohol, coffee, red wine, and dilute acids and alkalis, making it ideal for high-traffic or heavily used areas. The varnish is also non-yellowing and functions as an anti-graffiti coating,  Perfect for use on wood (indoors), concrete, and pre-painted surfaces.

Key Features:

• Available in Matt or Gloss Finishes
• Outstanding Abrasion Resistance
• Non-Yellowing for Lasting Clarity
• Resistant to Water, Stains, Chemicals, and Heat
• Anti-Graffiti Coating – Easy to Clean
• Clear Water-Based 2K Polyurethane
• Suitable for Wood (Interior), Concrete & Painted Surfaces

Surface Preparation

Ensure surface to be varnished is clean, dry, sound and free from wax, oil or any other
contamination. If wax has been used clean the surface thoroughly with white spirit prior to
sanding. Bare wood should be sanded to a smooth surface, always working with the grain.
Sound previously varnished surfaces should be lightly sanded to provide a key. New
concrete must be at least 30 days old prior to varnishing plus 1 week per cm if the concrete is above 4 cm thickness.
The moisture content of the substrate may not exceed 4%.
Concrete must be clean, dry and free from any surface laitance (a weak dusty layer on new
concrete) and any other surface contaminants such as oils, grease, dirt etc. prior to
applying the varnish. Not suitable for direct use on power floated concrete.

Technical Data 

Density (g/cm³): 1,06
Gloss Level: Gloss,Matt
Gloss level at 60º: 80% (Gloss)
Gloss level at 85º: 10% (Matt)
Solids content in volume: 40%
Mixing Ratio: Base : Activator = 2,04 : 0,46 (Volume) = 4 : 1
(Weight)

Directions for Use

Base and activator are supplied in correct proportions. First stir the base component, then
add activator gradually to the base, and mix thoroughly. DO NOT MIX PART UNITS. Wait 5
min after mixing. Do not store mixed product (residue) in a closed can. Badly activated or
incorrectly mixed materials will affect performance and may cause early failure or
discolouration.
When used outdoors on top of pre-painted surfaces: If the old paint is not UV-resistant, the use of Multi-surface PU Heavy-Duty Varnish is not recommended.

Data Sheets

Rust-Oleum 4900 Heavy-Duty PU Varnish TDS

Rust-Oleum 4900 Heavy Duty PU Varnish MSDS