Primers and bonding agents — balcony waterproofing

ARDEX WPM 265 is a red, water-based acrylic penetrating primer that seals porous substrates and creates a positive bond between the substrate and most water-based coatings/membranes (e.g. ARDEX Superflex), for internal and external floors and walls. Suits concrete, timber, fibre-cement sheet, marine plywood, renders, screeds and masonry. ~6 m²/L; recoat 1 h; VOC 11 g/L; 20 L pails.

ARDEX WPM 300 (HydrEpoxy) is a two-component, water-based epoxy primer/barrier coating that acts as a moisture barrier over green or damp concrete (withstanding 250 kPa — a 25 m head of water), a low-vapour-transmission barrier, and a primer for ARDEX liquid membranes and tile adhesives. AS/NZS 4020 potable-water compliant; VOC 26 g/L; 4 L and 20 L kits; grey or Mojo Black.

ARDEX WPM 240 is a solvent-based, bitumen-modified primer used to seal and prepare substrates before the installation of torch-applied (Shelterbit) bitumen membranes. Black liquid; 20 L pail.

SikaTile-010 Secure Prime is a high-performance, ready-to-use, 1-part primer with efflorescence-inhibiting crystalline technology that reduces the porosity of concrete, screeds and renders and dries to a keyed finish for excellent adhesion of tiles and Sika coatings (e.g. Sikalastic Moisture Seal). Applied by brush, roller or low-pressure spray.

Sika Sikalastic Moisture Seal is a moisture-tolerant primer used over green/young screeds and renders and autoclaved aerated concrete (AAC) ahead of a Sika Sikalastic liquid membrane. Confirm the substrate moisture limit and overcoat window against the current Sika Australia TDS.

Fosroc Nitobond SBR is a water-resistant modified styrene-butadiene-rubber emulsion (white liquid) for improving the strength and adhesion of concrete repair mortars, cementitious floor toppings and screeds, waterproof renders and cementitious slurries — used as a bond coat and as a gauging admixture. Supplied via Parchem Construction Supplies (DuluxGroup).

Fosroc Nitobond EP is a two-component epoxy bonding agent for bonding fresh wet cementitious materials to existing cementitious surfaces, internal and external. It may also be used as a substrate/repair barrier within a repair system where the substrate is likely to remain permanently damp or wet. Supplied via Parchem (DuluxGroup).

Gripset 11Y is a concentrated SBR latex polymer admixture that enhances adhesion, strength, water resistance and general performance of cement-based compounds — used as a high-bond slurry primer (1:1:1 with sharp sand and cement, ~1 mm) and as a gauging admixture, including for immersed/subterranean areas, pools and tanks. Slurry-primer coverage ~1 L per 3 m².

Tremco TREMproof Torch Bitumen Primer is a solvent-based, modified-bitumen primer that assists adhesion of the TREMproof Torch and TREMproof 560A membranes to the substrate. Applied at 6–8 m²/L; allow to become tack-free before applying the membrane.

Westox Wesprime is a pre-mixed primer for wood, cement roof tiles, cement render, concrete or sound previously-coated substrates to be coated with Westox Colourcote, Satintex, Glosstex or Wesdex. Allow one hour drying before applying the top coat.