Porter’s Mineral Silicate Primer is a premium silicate based clear primer, primarily for use to prepare masonry surfaces for the application of Porter’s Mineral Paint. Also excellent for use as a penetrative primer for new unpainted interior set plaster, and to bind surfaces on very aged, powdery or chalky lime washes or cement based paints.
Touch Dry
20 minutes
Cleaning materials
Water
Application Tools
Brush, Roller, Other
Mineral Silicate Primer is not suitable for use on glazed bricks, glazed tiles, timber, metal, and paper-faced plasterboard. Mineral Silicate Primer will not bond to synthetic compounds such as epoxy or silicone. Application by spray gun is inadvisable because of the effects of alkaline overspray onto nearby glass, vehicle finishes etc. Ensure all glass, aluminium, metal finishes and vehicles are protected from Porter’s Silicate Primer, which, due to the silification bonding process, etches on and can prove extremely difficult to remove. Do not apply Mineral Silicate Primer over construction or expansion joints. Do not apply in high humidity, below 10°c or above 30°c.
Do not apply paint if Relative Humidity is above 85% or temperature is within 3°C of Dew Point. Do not apply if the surface temperature is greater than 30°C or below 10°C, or likely to fall below 10°C during the application or drying period. On hot, dry or windy days whenever possible work in shaded areas, following the sun around the structure. Splashes onto glass, footpaths, timber etc should be removed immediately with water.
Re-coating powdery, chalky lime wash or boncote cement paint
Porter’s Mineral Silicate Primer will bind powdery or chalky paint to the original surface, allowing adhesion of further coats, or an undercoat sealer (if moving to another paint system) without compromise. Apply 1 coat of Porter’s Mineral Silicate Primer to entire wall surface by brush or roller. Touch dry 20 minutes. Allow 2 hours dry time before over coating.
New/unpainted masonry substrates
Substrate should be a clean well-held surface free from loose material, dirt, grease, oil and mould. Surface should be thoroughly swept and hosed to remove all dust, loose sand and projecting cement material. Complete the painting of all adjacent surfaces and trim items prior to the application of Porter’s Mineral Silicate Primer. Apply 1 coat of Porter’s Mineral Silicate Primer to entire wall surface by brush or roller. Touch dry 20 minutes. Allow 2 hours dry time before over coating.
Off-form concrete and tilt-up slab construction
Concrete and tilt-up surfaces require a thorough acid wash to remove ALL traces of bond breakers/release agents and importantly, to remove any “glazed” or “polished” appearance, as Mineral Silicate Primer can only adhere to an absorbent masonry surface. Apply 1 coat of Porter’s Mineral Silicate Primer to entire wall surface by brush or roller. Touch dry 20 minutes. Allow 2 hours dry time before over coating.
Unpainted interior set plaster
Set plaster requires a penetrative binder/primer prior to application of an undercoat. Apply 1 coat of Porter’s Mineral Silicate Primer to entire wall surface by brush or roller. Touch dry 20 minutes. Allow 2 hours dry time before over coating with Porter’s Limeproof Undercoat Sealer.
Do not apply paint if Relative Humidity is above 85% or temperature is within 3°C of Dew Point. Do not apply if the surface temperature is greater than 30°C or below 10°C, or likely to fall below 10°C during the application or drying period. On hot, dry or windy days whenever possible work in shaded areas, following the sun around the structure. Splashes onto glass, footpaths, timber etc should be removed immediately with water.
New/unpainted masonry substrates
Substrate should be a clean well-held surface free from loose material, dirt, grease, oil and mould. Surface should be thoroughly swept and hosed to remove all dust, loose sand and projecting cement material. Complete the painting of all adjacent surfaces and trim items prior to the application of Porter’s Mineral Silicate Primer. Apply 1 coat of Porter’s Mineral Silicate Primer to entire wall surface by brush or roller. Touch dry 20 minutes. Allow 2 hours dry time before over coating.
Off-form concrete and tilt-up slab construction
Concrete and tilt-up surfaces require a thorough acid wash to remove ALL traces of bond breakers/release agents and importantly, to remove any “glazed” or “polished” appearance, as Mineral Silicate Primer can only adhere to an absorbent masonry surface. Apply 1 coat of Porter’s Mineral Silicate Primer to entire wall surface by brush or roller. Touch dry 20 minutes. Allow 2 hours dry time before over coating.
Unpainted interior set plaster
Set plaster requires a penetrative binder/primer prior to application of an undercoat. Apply 1 coat of Porter’s Mineral Silicate Primer to entire wall surface by brush or roller. Touch dry 20 minutes. Allow 2 hours dry time before over coating with Porter’s Limeproof Undercoat Sealer.
Re-coating powdery, chalky lime wash or boncote cement paint
Porter’s Mineral Silicate Primer will bind powdery or chalky paint to the original surface, allowing adhesion of further coats, or an undercoat sealer (if moving to another paint system) without compromise. Apply 1 coat of Porter’s Mineral Silicate Primer to entire wall surface by brush or roller. Touch dry 20 minutes. Allow 2 hours dry time before over coating.
