Please note that due to the current Coronavirus situation, all Rust-Oleum products are subject to a 10 day lead time.
White Mould Resistant Masonry Sealer 8399 is a fast drying, non-yellowing sealer for use on mineral substrates like concrete, brick and plastered walls, masonry and mineral fibre board.
It is formulated to be over coated with hygenic topcoats and resists occasional product spillage, frequent chemical cleaning, intermittent high humidity and moisture.
New concrete, plastered or brick surfaces should cure and dry for at least 30 days prior to the application of coatings. Remove grease, oil and all other surface contaminations using ND14 Cleaner Degreaser or high pressure (steam) cleaning. Wash total surface with plenty of fresh/warm water or high pressure (steam) cleaning in order to remove all remnants of contamination and cleaners.
Sand previous coatings, which are in good condition to remove gloss and to roughen the surface slightly to create a ‘key’. Remove loose old coatings. The surface must be clean and dry during application.
Application and Thinning
Brush/Roller: from -10 to 5°C 10-20 vol. %; Thinner 633.
5°C Up to 5 vol. %; Thinner 633.
Use brushes based on a mixture of synthetic/natural bristles or medium pile polyamide (perlon 8-12 mm.) rollers. Roller application may require 2 coats to achieve the recommended dry film thickness.
Air-atomised spray: from -10 to 5°C Up to 15 vol. %; Thinner 160
> 5°C 10-20 vol. %; Thinner 633
Gravity cup and pressure cup. Tip size: 1.2 -1.8 mm
Atomising pressure: 2 - 4 bar.
Airless spray: from -10 to 5°C Up to 15 vol. %; Thinner 160
> 5°C up to 10 vol. %; Thinner 633
Pneumatic and electric airless equipment.
Tip size: 0.015-0.021 inch.
Fluid pressure: 150 - 200 bar.