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How To Paint Exterior Mildew Areas

Follow our 3-step guide below on how to paint over exterior mildew with Zinsser products – with no bleed through.

Looking for help with how to treat interior mould and mildew? See our blog posts below.

Quick Links

Zinsser Paint Exterior Mildew Products

The Benefits

Step 1. Surface Preparation

Step 2. Priming

Step 3. Decoration

More Information

Further Reading


Zinsser Paint Exterior Mildew Products

Zinsser Mould Killer & Remover

Zinsser Universal Degreaser & Cleaner

Zinsser Cover Stain

Zinsser AllCoat Exterior Satin/Gloss

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The Benefits

Mildew on external surfaces is produced by trapped moisture in humid environments, usually by a build up of dirt. Keeping external areas clean and clear can help prevent it from forming but for areas blighted by mildew, specialist coatings for masonry, cladding, and hygienic areas – typically with good stain blocking properties – can be used to simply painted over.

A common problem with painting over areas blighted by mildew is bleed through the top coating; the solution is in Zinsser’s Allcoat Exterior. The finish is designed for long term protection, with 350 colours available in satin or gloss.

Zinsser listens to contactors and develops new products – or adds features to existing products – to meet their changing needs, delivering world class products that meet “real world” challenges, providing tried and tested solutions to painting problems, such as painting over mildew.

Step 1. Surface Preparation

Surfaces must be clean and dry and free from anything that will interfere or affect with the adhesion and application of the materials and Zinsser products to be applied.

Remove loose and failing materials by scraping or brushing with a stiff bristle brush to a sound edge, feathering the sound edges with a fine grade abrasive paper. Visible signs of organic growth should also be removed and the area treated with Zinsser Mould Killer & Remover to clear any contaminants on the surface, rinsing thoroughly with clean water to clean any remaining residues.

Allow the surface to dry and then fill surface defects and any small cracks with an appropriate filler (in accordance with the manufacturer’s instructions), allowing it to dry before rubbing down with a fine grade abrasive paper and removing all dust.

Step 2. Priming

Zinsser Cover Stain should be used to prime all stained, bare and filled areas, in accordance with the manufacturer’s instructions, and allow a minimum drying time of two hours (in normal drying conditions) before decorating.

Step 3. Decoration

Now that the affected area has been prepared and suitably primed, decorate with two full coats of Zinsser AllCoat Exterior Satin/Gloss in accordance with the manufacturer’s instructions. Allow a minimum drying time of one hour between coats.

Zinsser AllCoat Exterior Satin/Gloss is designed for long term protection and is available in more than 350 colours.

More Information

If you require more advice on painting exterior mildew areas, give our technical team a call on 0113 2455450 (option 2) or send a message to [email protected].

Further Reading

Quick & Cost-Effective Ways To Paint Over Mould

Exterior Surfaces, And The Products To Clean Them

Food Safe Paint or Hygiene Coating? Which is needed for what

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