How Do I Paint Limestone/ Lime Rendered Walls?
Painting limestone can give your masonry a bright, new look. Limestone is a sedimentary rock formed of highly alkaline calcites, so thorough preparation is an essential first step before painting limestone. The prospect of painting limestone masonry may be daunting at first, but you can achieve an excellent finish by treating the rock with a specialist cleaner and an alkaline-inhibiting paint primer.
Cleaning & Preparation
Clean from all atmospheric, algae, mould contamination using Valtti Mould Removal Solution (1 part solution:4 parts water).
Scrub the surface with a stiff brush to remove any loose materials or dust. Start at the top of the wall and work your way down. Leave the surface to dry.
Priming
For flat limestone surfaces, use a regular paintbrush. For craggy or highly textured limestone surfaces, use a paint roller. Take care to dab the primer/sealer into all crevices. Using a primer/sealer helps coats of paint stick to the surface and prevents moisture and water damage. You may need to apply two coats of primer/sealer. Wait for the first coat to dry before applying the second.
Topcoat Options
Paint the treated limestone surface with our masonry paint, using either a regular paintbrush for flat surfaces or a medium-nap paint roller for textured and rough surfaces. You will need to apply more than one coat of masonry paint. Wait for the first coat to dry before applying the final coat.
Note: we always recommend conducting a test on a small area before painting limestone
If you require more advice on painting over limestone give our technical team a call on 0131 334 4999 or send a message to our technical team.
