Concrete wall – bubbling or blistering paint

Cause

Loss of adhesion due to excess moisture in substrate

Repair

  • a high moisture content in the concrete must be addressed before repainting
  • scrape and/or sand off loose paint; clean until surface is sound. Allow to dry thoroughly then repaint with a system suitable for concrete

Cause

Poor initial substrate preparation

Repair

  • a high moisture content in the concrete must be addressed before repainting
  • scrape and/or sand off loose paint; clean until surface is sound. Allow to dry thoroughly then repaint with a system suitable for concrete

Cause

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

Repair

  • scrape and/or sand off loose paint; clean until surface is sound. Allow to dry thoroughly then repaint with a system suitable for concrete

Cause

Surface was damp or dirty when painted previously

Repair

  • a high moisture content in the concrete must be addressed before repainting
  • scrape and/or sand off loose paint; clean until surface is sound. Allow to dry thoroughly then repaint with a system suitable for concrete

Cause

Dark colours increasing surface temperatures

Repair

  • scrape and/or sand off loose paint; clean until surface is sound. Allow to dry thoroughly then repaint with a system suitable for concrete

Cause

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

Repair

  • a high moisture content in the concrete must be addressed before repainting
  • scrape and/or sand off loose paint; clean until surface is sound. Allow to dry thoroughly then repaint with a system suitable for concrete