Agnews Water Putty - Hard-Setting Filler for Wood, Plasterboard, Concrete & More

Agnews Water Putty is a professional, powder-based repair and levelling compound for durable, long-lasting results. Mix only what you need with clean water, then patch, level or rebuild surfaces with confidence. Once cured, it sets rock hard, bonds permanently, and can be sawn, drilled and sanded to a smooth, paint-ready finish.

Key features

Brand: Agnews
Unlimited shelf life when stored dry
Non cracking, non shrinking, non sinking
Won't fall out – adheres firmly and fills to any depth
Interior & exterior grade (seal exterior applications after full dry)
Non flammable and no VOCs
Mix what you need for minimal waste

Suitable substrates

Plasterboard, concrete, wood/timber, cement sheet, masonry. Also suitable for minor floor levelling and feathering on concrete, timber and ceramic tile substrates.

Typical applications

Fill holes in wood: knotholes, nail and screw holes, dents, edge build-ups
Wall patching: cracks and cavities in plasterboard and cement sheet
Furniture repair: tighten loose joints, reset fasteners, rebuild profiles
Floor levelling: ramp or smooth minor level variations before floor coverings
Trim and fixtures: refit loose door bumpers and trims with reliable hold
Architectural & hobby moulding: casting and shaping durable components

Why choose Agnews

Agnews Water Putty cures to a dense, stone-hard finish that resists shrinkage and cracking even in deep fills. It bonds securely, stays put, and finishes cleanly, delivering a stable base for sanding, priming and painting. From small touch-ups to larger restorations, it provides consistent, professional results.

Directions (general guide)

Surface prep: Ensure the area is clean, dry, sound and free of dust, oil or loose material. For very porous substrates, lightly dampen to reduce rapid suction.
Mix: Add powder to clean water and blend to a smooth, lump-free paste. Adjust water to suit application (thicker for filling, looser for fairing/skim).
Apply: Press firmly into cracks or voids with a putty knife or trowel. Overfill slightly so you can sand back flush.
Cure: Allow to dry thoroughly. Dry time varies with thickness, temperature and humidity.
Finish: Sand to profile. Prime and paint or seal. For exterior applications, always seal after full dry.

Exterior use guidance

This is a hard-setting, non-flexible compound. For exterior use, only apply over stable substrates with minimal expansion and contraction from temperature changes. Ensure the putty is fully dry before sealing with a suitable exterior-grade coating.

Finishing & compatibility

Paintable and sealable after full dry; prime as required for best results.
Can be cut, carved, drilled and sanded after cure without crumbling.
For stained timber finishes, test a small area first for colour and absorption.

Pro tips

Mix small batches and use promptly.
For deep voids, apply in layers if needed, allowing each layer to firm before the next.
Store powder in a cool, dry place to maintain its unlimited shelf life.
Clean tools with water before material cures.

At a glance

Substrates: plasterboard, concrete, wood/timber, cement sheet, masonry
Uses: patching, levelling, rebuilding, moulding
Properties: non cracking, non shrinking, non sinking, non flammable, no VOCs
Finish: hard, dense, smooth and paint-ready after sanding/priming

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