How do you spray 1-part paints such as Interlux Brightside, TotalBoat Wet Edge, or Pettit EZ-Poxy?

Type of spray application, nozzle or tip size, pressure, proper thinning, and technique are the fundamentals behind spraying 1-part paints such as TotalBoat Wet Edge, Interlux Brightside, Pettit EZ-Poxy, or Epifanes Monourethane paint. Though it should not be intimidating, the quality of the finish will be dependent on these subjects.

Proper reduction of these paints is the first step. Read the tech data sheet for each paint, or look on the label for the required thinning solvent for spray applications. Also, look for the percentage of thinner to add for spray application. This amount can range from 10%-40%, depending on the product and the conditions for application. Too little thinner will not atomize the product properly for even dispersion, and too much thinner can make the paint sputter and sag when it's applied, so the person applying also has to rely on personal judgment based on the feel, flow, and environmental conditions. Warmer conditions may require the maximum percentage of thinning. This will be different than the brushing/rolling thinner, because it does not need to extend the flow, it just needs to reduce the viscosity to atomize the paint. Interlux 216, Pettit 121, xylene, and Epifanes Spray Thinner for 1-part paints are examples.

These paints can be applied via airless, pressure pot, siphon, or conventional spray methods. There are other methods for spray that can work, but these are the recommended ways for these types of paints. For airless spray, the pressure should be roughly 170 bar/2500 psi, with a .33-.41 mm (11-16 thousandths) tip. When using a pressure pot, the pressure should be 3.44-4.47 bar/50-65 psi (gun pressure), and 8-10 psi (pot pressure), while the tip size should be .89-1.4 mm (35-50 thousandths). When using a siphon cup, the pressure should be roughly 3.44-4.47 bar/50-65 psi (gun pressure), with a 1.5-1.8 mm (60-70 thousandths) tip size.