The range

Three coatings. One system.

Every product does the same fundamental job, stopping moisture crossing the junction, but each is formulated for the substrate it protects, and each adds the defence that substrate specifically needs.

The three PRIME GUARD coatings

A gloved hand brushing black Wood Seal along the outer edge of a teak door frame on trestles, its front face left bare

For wood & plywood

Wood Seal®

Block moisture. Fight termites. Protect wood.

A premium coating for wooden door frames, window frames and plywood. It penetrates to the cellular level of the timber and creates a highly hydrophobic barrier that stays breathable, so trapped moisture is never sealed in, with an added termite-resistance formula and protection against fungal growth.

  • Hydrophobic yet breathable
  • Added termite resistance
  • Guards against fungal growth
  • Resists weathering & oxidation
Wood Seal in full
A worker brushing black Rust Shield into the hollow open back of an upright pressed-steel door frame, its front face left bare

For steel

Rust Shield®

Block moisture. Stop rust. Protect steel.

A high-performance coating for steel door frames, window frames, truss works and structural steel. It forms a tough film on the metal that keeps water off the surface, and where water cannot reach steel, rust cannot start. Suitable for interior and exterior use.

  • Advanced rust protection
  • Corrosion resistance
  • Strong adhesion to metal
  • Interior & exterior
Rust Shield in full
A gloved hand brushing glossy black Aqua Block along the top of a new concrete basement belt, before any wall is built on it

For concrete

Aqua Block®

Stop water. Protect concrete. Last longer.

A moisture-blocking coating for concrete basement belts and concrete door and window frames. It bonds into the concrete and forms a continuous waterproof barrier: a separation layer between concrete and masonry that keeps dampness out of the paint, plaster and finishes beside it.

  • Blocks moisture transfer
  • Helps prevent wall dampness
  • Waterproof barrier protection
  • New construction or renovation
Aqua Block in full

Choosing

Which one do I need?

Pick by what the surface is made of, not by where it is in the building. Most sites need more than one.

  1. 01

    Is it timber or plywood?

    Door and window frames, partitions, plywood, wooden floors and stairs: anything that can absorb water or feed termites.

    → Wood Seal

  2. 02

    Is it steel?

    Steel frames, truss works, mild-steel and fabricated members, and every point where metal is built into a wall.

    → Rust Shield

  3. 03

    Is the surface concrete or masonry?

    Basement belts, plinth bands, cast door and window frames, beams, columns, any damp-prone concrete.

    → Aqua Block

Side by side

The full comparison

Swipe the table to compare →

WOOD SEAL, RUST SHIELD and AQUA BLOCK compared by substrate, protection, mechanism, suitable surfaces, coats, timings, preparation, pack size and shelf life.
Property Wood Seal® Wood Rust Shield® Steel Aqua Block® Concrete
Substrate Wood & plywood Steel & mild steel Concrete & masonry contact areas
Protects against Moisture absorption, termite attack, fungal growth, surface deterioration Moisture, rust, corrosion, premature deterioration Moisture migration, wall dampness, moisture-related damage
How it works Penetrates to the cellular level; hydrophobic but breathable, so internal moisture is not trapped Forms a tough moisture-resistant film that reduces water contact with the metal Penetrates and bonds to concrete, forming a continuous waterproof barrier and a separation layer against masonry
Typical surfaces Door & window frames, wooden partitions, plywood, wooden floors, wooden stairs Steel door & window frames, truss works, fabricated components, structural members Basement belts, concrete door & window frames, beams, columns, damp-prone concrete
Coats 2, on the contact faces of the timber 2, on the wall-contact area 2
Recoat / hard dry 2–3 hrs / 5–8 hrs 2–3 hrs / 5–8 hrs 2–3 hrs / 5–8 hrs
Extra preparation Timber must be dry. Coat the faces that will contact wall, concrete or flooring. Remove existing rust with a wire brush or sandpaper before coating. Repair cracks or damaged concrete first. Never over standing water; not during rain.
Pack / shelf life 1 Litre / 24 months 1 Litre / 24 months 1 Litre / 24 months
Tagline Block moisture. Fight termites. Protect wood. Block moisture. Stop rust. Protect steel. Stop water. Protect concrete. Last longer.

Coverage varies with substrate type, surface condition, roughness and applied thickness, so no single figure fits every job. Tell us about your site and we will help you work out quantities.

Protect • Preserve • Perform

Not sure what your site needs?

Send us the junction details (substrate, exposure and quantity) and we will tell you which product belongs where.

Ask a question Application guide