Symptoms
The bleeding through of contents of the
substrate through existing paint layers
or systems.
Cause
-
Certain timbers such as Western Red Cedar, Oak, Meranti or Idigbo are prone to bleeding
-
Chemicals within timbers prone to bleeding
(i.e. timbers with a high natural extractive content) are mobilised by water
-
Colours from previous coatings such as bitumen or creosote can bleed through
-
Problem more prevalent with water-borne coatings.
Solution
Clean the coating surface to make sure that the bleeding components have been removed and apply a fresh coating system. Apply sufficient layer thickness to prevent water from dissolving the bleeding wood content. Apply a full primer coat of Onol or Cetol BL Primer. Finish with one or two coats of Rubbol AZ, Rubbol Satura or Cetol BL Opaque respectively.