Secret of Sheen – the Second Coat Is Most ImportantPosted on May 10th, 2016 By Bob Flexner No comments
Secret of Sheen – the Second Coat Is Most Important
The second coat of finish you apply to a project, after you have sanded the first coat smooth, is the most important coat because it provides the depth and sheen. Sometimes you can improve the depth with additional coats, but nothing equals the difference obtained from the first to the second.
Most important in this instruction is that you have to sand the first coat smooth to obtain the full effect. If you don’t sand this coat smooth, the roughness will telegraph through the second coat and reduce the depth and lower the sheen.
The surface will also feel rough. A further point to emphasize is that you can’t ever achieve the full effect of a finish with just one coat, no matter how thick you apply it. This rule holds true for all finishes – even oil finishes.
Spray Pattern Heavier on One Side
A spray pattern, with all the controls on the spray gun wide open, is supposed to be an even, elongated oval shape. If the pattern is heavier on one end than the other, the likely cause is that one or more of the holes in the air cap is plugged up. It’s also possible that the fluid nozzle has been damaged.
To determine which, rotate the air cap one-half turn (180 degrees) and spray again. If the disrupted pattern switches sides, the problem is in the air cap. If the pattern stays the same, the problem is the fluid nozzle.
To clean the air cap, soak it in acetone or lacquer thinner to dissolve or soften the obstructing matter, then blow it out with compressed air if you have it. You can also use very small-diameter picks supplied with spray-gun cleaning kits such as the one offered by TheFinishingStore.com (please link)
Be very careful trying to use a toothpick, because it might break off in the hole and be difficult to remove. Above all, you don’t want to use any metal that might damage the hole.
If you determine that the fluid nozzle has been damaged, you will have to replace it. The fluid nozzle and needle are usually sold in sets.