FAQ and HOW TO

Answers to the most frequently asked questions about our products

Is there any sealer I can put on that will last?

A few years ago we built an exterior wooden deck. I sealed it the first year with a mainstream toxic product that was "guaranteed" to last 10 years. It didn’t even last one year. We've used other clear water repellent sealers since, which only last a half a year or so. Is there any sealer I can put on that will last?

Exterior wood is prone to surface damage from sunlight and moisture as well as temperature changes and other environmental conditions. It swells and shrinks every time it rains. This causes stress at the interface between the wet and dry wood cells, which results in cracking. Without protection, it exhibits surface discoloration and damage. Studies by the national Forest Products Laboratory have found that clear water repellent sealers last only six months to a year, while pigmented stains and sealers tend to last somewhat longer, although typically no more than two or at most three years. The pigments absorb ultraviolet light, keeping the lignin that holds wood fibers together from breaking down. So you can use Durostain in any color, followed by a coat of Watershield, or you can use Safecoat Naturals Oil Stain, and extend the life of the sealer. But treat wood as a living thing which needs maintenance, and recognize that the environmental conditions to which it is exposed means that it will need sealing more often than a dimensionally stable surface such as concrete.

For Roofguard I read that "Spray application is the preferred method." I'll be buying a spray gun and air supply for the very first time.

For Roofguard I read that "Spray application is the preferred method." I'll be buying a spray gun and air supply for the very first time.
1. Can you give me any tips about required pressure and/or orifice size?
2. It's so thick that I wonder if you need a pressurized pot.
In that connection, is a turbine air supply going to provide adequate pressure?
3. How about degree of dilution if water is needed to thin Roofguard?

An airless sprayer is the most efficient way to apply roof coatings. Airless sprayers use a hydraulic pump to atomize the coating. Elastomeric roof coatings require higher pressures and flow rates than paints. A roof rig usually has a minimum pressure of 3000 psi with a flow rate of of 3 gallons per minute. A siphon hose on the material inlet typically is used to draw material directly from 5-gallon pails. A spray gun with an extender wand allows for comfortable coating application without having to hold the spray gun uncomfortably close to the surface. An ideal spray tip is 6" 0.31 for thicker type roof coatings. Tips should be reversible for easy cleaning and clearing of occasional tip clogs.
Proper spray technique involves keeping a gun level with a roof's surface at all times, maintaining a consistent distance between the spray tip and surface. Use a overlapping, crosshatch pattern to ensure complete coverage and a uniform finish.
For smaller jobs or one time application, it will be more economical to rent a unit. An airless sprayer is recommended with at least a 10:1 piston type pump. Gun tips should be at least 0.23 in size. You will need at least 2500psi to push the coating. Air turbines are not adequate. Pressure pots are impractical. Water dilution will reduce the film thickness and result in lower performance and longer labor times to achieve the same results. Roller application is more economical for small jobs. Large rollers of at least 18 inches in width can move the rate of application along for larger jobs. Squeegie application followed by a roller has been successfully used to apply roof coatings.

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