Symptoms
Depending on the wood species
used, natural timber extractives/
exudates may migrate to the surface
of the timber and stain the paint
system and/or adjacent surfaces
(eg. render).
Cause
-
Insufficiently degreased surface during pre-treatment
-
Timber not coated all round
-
Insufficient coating applied (particularly to end grains)
Solution
Remove all contaminants and redecorate affected area. Pay special attention to end grain.