Kicks Korner #13
I’d like to start out this column by adding a post script to issue #12’s article on blending new clear coat into an existing clear. For this to work properly the clear that you are blending into must be totally cured,... not just dry, but fully cured. It will work best on factory, or older clear. When you sand the clear it opens the surface up,... then spraying the blending reducer over that area between the old and new clear can cause an adverse reaction and a chance of wrinkling can occur. Clear coat can be dry enough to sand and buff a day after being sprayed, but may not be cured. It is still my contention that it is always better to clear the entire panel whenever possible. Hello, I’ve been painting goalie masks for about a year with a single action brush and I’m ready to invest in a duel action airbrush. I’ve narrowed it down to a Paasche VL or an Iwata Eclipse BCS. The question is interchangeable tips vs. nozzle? Pros and Cons? (I am using mostly acrylics). Any guidance would be appreciated. Thanks, Charlie Hello Charlie,... The dual-action, internal mix, bottom feed VL can handle colours from thin to heavier consis- tencies and sprays from fine detail to broad coverage with the use of multiple interchangeable heads and needles. This feature makes the Passche VL one of the most versa- tile airbrushes around and a favourite of many artists. For many years it was the workhorse of the industry. TIPS: #1-0.50mm,... #3-0.75mm,... #5-1.00mm. I guess if there is a down side to this brush,... it’s that you have to keep changing tips, and I’ve also heard a few complaints about the size of the brush, it’s a little bigger around then the Iwata. The Eclipse BCS is a multi-purpose, high detail airbrush designed for a wide variety of uses. It is commonly used to spray pre-mixed or heavy paints and is well suited for uses demanding precise control where moderate to large amounts of paint are being applied. Eclipse airbrushes are so versatile that one size needle and cone-shaped fluid tip is all that is required. TIP SIZE: 0.5mm. These airbrushes can spray fine lines to large backgrounds using thin to heavy paints. Even stippling patterns can be achieved by simply removing the air cap. No need to change heads, one head does it all. My person- al preference is the BCS,... but either way,... Your going to think you died and went to heaven after using a single action. Thanks for the letter.
Hi Kicks, Whenever I clear a project of any size I’m constantly adjusting the air pressure on my spray gun, I have a fairly large older compressor but it has been painted over and there are no markings so I’m not sure about HP or CFM that it produces. Any help would be appreciated. John W. Hello John,... your problem is a pretty common one, es- pecially if you are using a HVLP gun. You say that the compressor is pretty large, so lets assume that it is produc- ing enough CFM to run the gun. The biggest problem that most people have is the loss of air pressure between the compressor and the gun. The following factors contribute to pressure drop in con- ventional air spray and HVLP (High Volume Low Pres- sure) systems. Just one weak point may cause a major loss of pressure.
• Air hose that is too small in diameter • Air hose that is longer than required or necessary • Too many quick disconnect fittings in the system •Restrictive quick disconnect designs •Low performance air regulators Quick connects are convenient, but depending on design, can be a major source of pressure drop. Ask yourself, does the application require them? If the air hose is not removed from the gun more than once or twice per day, these devices should probably be avoided. As an example, a beginning pressure of 75 psi from the air filter and regu- lator unit is reduced to 67 psi after going through a typi- cal quick disconnect. Traveling through 25 ft of 1/4 inch hose at 25 cfm, air pressure drops to 36 psi before going through another quick disconnect and losing another 8psi.. Your air hose can also be a major factor, with a smaller and more restrictive passage, less air gets through the line. Using a 1/4 inch (6.3 mm) hose means less pressure at the gun than when using the larger 3/8 inch. Length of hose counts as well, don’t use a 50 foot hose if a 25 foot will do, you‘ll lose approximately 1 psi per foot. All these factors will starve your gun for air when your compressor may well be supplying all that you need. Try using the shortest length of large diameter hose, attached directly to the regulator and the gun, I think you’ll be surprised at the difference.
Send your questions to
kickskorner@sympatico.ca
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