Bitumen-impregnated cladding – bubbling or blistering

Cause

Loss of adhesion due to excess moisture in substrate

Repair

  • scrape and/or sand off loose paint; sand until surface is sound; prime; fill joints with putty or exterior grade flexible (polyester) filler; paint with minimum two coats semi-gloss or high gloss acrylic paint

Cause

Poor initial substrate preparation

Repair

  • scrape and/or sand off loose paint; sand until surface is sound; prime; fill joints with putty or exterior grade flexible (polyester) filler; paint with minimum two coats semi-gloss or high gloss acrylic paint

Cause

Oil-based (alkyd) paint applied over water-based (latex) paint

Repair

  • scrape and/or sand off loose paint; sand until surface is sound; prime; fill joints with putty or exterior grade flexible (polyester) filler; paint with minimum two coats semi-gloss or high gloss acrylic paint

Cause

Surface was damp or dirty when painted previously

Repair

  • scrape and/or sand off loose paint; sand until surface is sound; prime; fill joints with putty or exterior grade flexible (polyester) filler; paint with minimum two coats semi-gloss or high gloss acrylic paint

Cause

Dark colours increasing surface temperatures

Repair

  • scrape and/or sand off loose paint; sand until surface is sound; prime; fill joints with putty or exterior grade flexible (polyester) filler; paint with minimum two coats semi-gloss or high gloss acrylic paint

Cause

Swelling/shrinkage caused by moisture absorption into the substrate

Repair

  • scrape and/or sand off loose paint; sand until surface is sound; prime; fill joints with putty or exterior grade flexible (polyester) filler; paint with minimum two coats semi-gloss or high gloss acrylic paint

Cause

Water-based paint coat exposed to moisture before paint has fully dried

Repair

  • scrape and/or sand off loose paint; sand until surface is sound; prime; fill joints with putty or exterior grade flexible (polyester) filler; paint with minimum two coats semi-gloss or high gloss acrylic paint