DORVALIT® WSP is an innovative Dorfner REFINERALS®-class filler with exceptional, proven performance in wood primers. The patented Wood Stain Protection Technology (WSP) is highly effective in preventing wood extractives such as polyphenols from migrating into the topcoat and causing unsightly discoloration in light-colored finishes. In contrast to standard stain-blocking additives which contain metals, DORVALIT® WSP is eco-friendly and no special labelling is required.
Not only is DORVALIT® WSP extremely effective, it also has tangible economic benefits. The filler enhances performance in nearly any existing primer formulation. In new formulations, DORVALIT® WSP can be a key factor in reducing labor, and one coating step can possibly be eliminated. All factors considered, DORVALIT® WSP has the potential to reduce total costs by more than 25%.
DORVALIT® WSP is a new filler for wood primers that sets new standards in barrier performance. DORVALIT® WSP provides outstanding protection for light-color wood finishes, preserving the attractive appearance for years without spots and blemishes.
The results are highly impressive. Adding DORVALIT® WSP to wood primers effectively prevents spotting and it is very cost-efficient.
Wood samples with standard-formulation wood primer applied. A: plus 15 % calcium carbonate. B: plus 15 % calcium carbonate and 2 % inhibitor. C: plus 15 % DORVALIT® WSP.
Samples merbau, primer and commercial topcoat with uniform coating thickness (200 µm).
A: Mode of action of DORVALIT® WSP. B: Lock-and-key mechanism.
The innovative DORVALIT® WSP fillers are firmly bound in the primer matrix. If any colored extractives penetrate into this layer, they are immediately detected and intercepted by the adjusted filler particles and irreversibly bound. The extractives can get no further. They cannot migrate as far as the topcoat where they might otherwise cause discoloration.
The effectiveness of Dorfner DORVALIT® WSP is based on a new and highly effective mode of action. The modification, which is firmly attached to the filler, provides specific docking sites for colored polyphenol wood extractives. If the extractives come into contact with DORVALIT® WSP particles, they are immediately bound by the action of the lock-and-key mechanism and rendered harmless.