Recent Trends in Architectural Coatings
September 2016 www.coatingsworld.com Coatings World | 121
feel of an oil-based wood stain for their
deck or gazebo, these materials offer the
advantages of good penetration into the
wood as well as a water-repelling effect.
In general, they need to be re-applied every year or two. However, these materials are generally very high in VOC and
only allowed, in their traditional form, in
33 states. Today product developers are
working with low volatility oils and oil
derivatives that can provide acceptable
application viscosity with less reducing
solvent. In some cases, exempt solvents
can be used to allow viscosity reduction without adding to the VOC value.
Reduction of VOC of the finished product to 275 g/L allows it to be sold in most
areas of the United States, although the
South Coast Air Quality Management
District of California requires 100 g/L.
Similar to the paint analogs, the lowering
of VOC in these products presents some
challenges as return-to-service time (due
to long dry time) and dirt pickup resistance (Figure 6) can be compromised.
Figure 6: Dirt resistance of an oil-based wood stain formulated at 550 g/L VOC (left) vs. 275 g/L VOC
(right).
Figure 7: A multicolor paint which imitates the look
of natural stone.
Figure 8: A textured finish containing colored
flakes.
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