Rustoleum 769/780 Damp-Proof Rust Primer is a single pack rust primer based on a fish oil containing alkyd for direct application on slightly moist or dry metal surfaces. 

Features

• Requires minimal surface preparation
• Penetrates deep into the rust for optimal protection
• Expels moisture & air from the surface
• Can be applied on slightly damp surfaces
• Unique proven formula based on fish oil since 1921

Recommended Use

769 is specially developed to be applied on hand tool prepared sound rusted steel surfaces. Can be applied on slightly damp surfaces and provides protection under C4 exposure (ISO 12944) conditions with system:

• 769
• 1080 
• Alkythane® 7500

Surface Preparation

Remove grease, oil and all other surface contaminations with Rust-Oleum ND14 cleaner or high pressure (steam) cleaning in combination with appropriate detergents. Remove rust scale, loose mill scale, loose rust and loose coatings by scraping and wire brushing to St 2 (ISO 8501-1: 1988), light blast cleaning or sanding. Sand previous coatings, which are in good condition to roughen the surface slightly. The surface must be clean and preferably dry during application. 

Application & Thinning: Brush

Dilute up to 10% volume RUST-OLEUM Thinner 633. Use natural bristles, long hair brushes.

Application & Thinning: Roller

Dilute up to 10% volume RUST-OLEUM Thinner 633. Use medium nap, polyamide 8 -12 mm rollers. Roller application may require 2 coats to achieve recommended dry film thickness.

Application & Thinning: Airless Spray

If required, up to 5% volume RUST-OLEUM Thinner 641. Pneumatic and electric airless equipment. Tip size: 0.013-0.015 inch Fluid pressure: 130 - 200 bar.

Application & Thinning: Air-Atomised Spray

10-20% volume RUST-OLEUM Thinner 641. Gravity cup and pressure cup. Tip size: 1.2 -1.8 mm. Atomising pressure: 2 - 4 bar