To get a fair and reliable result from the water uptake tests, both Anker Stuy Coatings and the market reference products have been tested on redwood (softwood) and sapele/sapelli (hardwood).
The tests were carried out with the settings and conditions listed below:
- Application: Airmix spraying
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Substrate:
- Redwood sealed according to EN 927-5
- Sapele coated on front and edges, no extra sealing
- Drying time: 2.5 hrs at 15°C and 75% relative humidity (RH) after each coat
- Measurement: weight increase (= water uptake) according to EN 927-5, after 24, 48, 72, and 144 hours at 12°C and 60% RH
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System 1 |
System 2 |
System 3 |
System 4 |
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First coat (150µm wet) |
Hydrolux Baseprimer white / market reference (MR) primer |
Hydrolux Baseprimer white / market reference (MR) primer |
Hydrolux Topcoat SM RAL 7026 / Market reference (MR) low gloss topcoat RAL 7026 |
Hydrolux Baseprimer white / market reference primer (MR) |
Water Uptake Results for Redwood
Water Uptake Results for Sapele in Milligrams
In both the chart and figures, you can see that the Anker Stuy systems have less water uptake than the market reference in all systems. Note: Sapele panels generally have higher water uptake compared to redwood because their end grains have not been sealed.
Numbers don't lie, but how do the panels look after these tests? We took photos after each test, resulting in the overview below:
Water Resistance After 1 Day
(3 samples on the left are redwood, 2 samples on the right are sapele)
Anker Stuy (AS): no blisters
Market Reference (MR): blisters in systems 1, 2 (strong), and 4 (very strong)
Water Resistance After 2 Days
(3 samples on the left are redwood, 2 samples on the right are sapele)
Anker Stuy (AS): no blisters
Market Reference (MR): blisters in systems 1, 2 (strong), and 4 (very strong)
