Flaking: The splitting of a dry paint film through at
least one coat, which will lead to complete failure of the
paint. Early on, the problem appears as hairline cracks;
later, flaking of paint chips occurs.
Use of a lower quality paint that has inadequate adhesion
Over thinning the paint or spreading it t(x) thin.
Poor surface preparation, especially when the paint is
applied to bare wood without priming.
Painting under cool or windy conditions that make latex
paint dry too fast.
It may be possible to correct cracking that does not go
down to the substrate by removing the loose or flaking
paint with a scraper or wire brush, sanding to feather the
edges, priming any bare spots and repainting. If the
cracking goes down to the substrate, remove all of the
paint by scraping, sanding and/or use of a heat gun; then
prime and repaint with a quality exterior latex paint.