Using Waterborne Paint - Hydrophobia

There's No Need to Fear Today's Line of Waterborne Paint

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01. With all of the bodywork done, Best of Show Coachworks' Jon Lindstrom did one final pass with 600-grit 3M paper. If the car wasn't going to get a sealer coat, he would have used 800 grit.

1306 Using Waterborne Paint 600 Grit 3m 2/18

02. All taped up and ready to go. One nice aspect of shooting a solid (i.e., non-metallic/pearl) is that panel orientation isn't critical since we didn't need to worry about how the flake or pearl would lay down, or "flop." It also meant we didn't need to worry about shooting all the panels at the same time. The parts not seen here will be shot later, once we have the Chassisworks subframe back under the car and the panels in place so that we can lay down the graphics.

1306 Using Waterborne Paint Car Taped 3/18

03. Before spraying, we made sure all of our seams were properly sealed with some Evercoat Maxim Flow Control. After all, it's not something we could do after painting.

1306 Using Waterborne Paint Evercoat Maxim Flow 4/18

04. In the paint booth, Jon used a lint-free towel and wiped the car down with some wax and grease remover.

1306 Using Waterborne Paint Use Lint Free 5/18

05. The last step before grabbing the paint gun, was to go over the Camaro with a Axalta Sontara Tack Cloth (PN E-4140). This helped to get the tiny bits and pieces off the body so it didn't contaminate the sealer.

1306 Using Waterborne Paint Axalta Sontara Tack 6/18

06. The Axalta Premier Sealer is a three-part system and was mixed at a ratio of four parts sealer to one part Reactive Reducer and one part Activator Reducer.

1306 Using Waterborne Paint Axalta Premier 7/18

07. Axalta has come up with a system for their sealers called Value Shading. The theory is that a color is described by three dimensions: hue, saturation, and value. Hue describes the dominant wavelength or "color" (e.g., green, red, or blue). Saturation describes the purity of the color, or how much the color has been diluted with white. Value, or tone, describes the brightness or darkness of the color. Value is the element of color that most controls the number of coats needed to achieve full coverage. The Value Shade for our particular color of blue turned out to be four.

1306 Using Waterborne Paint Axalta Value Shading 8/18

08. By using a primer/sealer that is pigmented to the correct value (shades of gray from light to dark), the number of coats to get full coverage can be greatly reduced, and less paint equates to a lower cost in materials. Even though this is less important with a high-solids waterborne paint like Cromax Pro compared to solvent-based systems, it still helps. Here, Jon lays down a nice coat of sealer. As always, he starts at the top and works his way down and around the car.

1306 Using Waterborne Paint Lay Down Coat Of 9/18

09. One common misconception about waterborne paint is that the whole system is water-based rather than solvent. This isn't the case. Only the actual color, or basecoat, is waterborne. The rest, such as the sealer and clearcoat, are traditional solvent-based products. Still, shooting waterborne does require a stainless gun so it doesn't develop rust. For this job, Jon busted out his Iwata stainless LPH400 gun. The orange tip is what he uses for basecoats and sealers. Expect to pay between $400 and $500 for a gun of this caliber and the tip, or air cap, is another $130.

1306 Using Waterborne Paint Iwata Stainless Lph400 10/18

10. When paint sits around it can separate with the pigments settling to the bottom of the can. Obviously this is bad, so we tossed our paint on the shaker to get it all mixed up proper like. Our color was chosen off of Axalta's Spectramaster Color Atlas and the code is CAS471. Now, be forewarned that the color you see on the little 1-inch square may or may not look the same when it's covering an entire car.

1306 Using Waterborne Paint Put Paint On The 11/18

11. The color we were trying to nab was one we saw on a '53 Porsche, which they called Azure Blue, and since we've been swamped, we didn't get a chance to do a spray-out panel before shooting the entire car. Let's just say we got real nervous when Jon started laying out the first coat of what looked like Neon Aqua Blue.

1306 Using Waterborne Paint Azure Blue 12/18

12. The way waterborne paint changes shades as it dries is a lot different than how solvent paint does. Here you can see the huge color difference between the wet area (that's shiny) and the drier area that is more matte. Cromax Pro utilizes a wet-on-wet application process. This means there's no need to let the first coat of color flash before shooting subsequent coats. Also, due to a higher solids composition, you can achieve full coverage in as little as one and a half coats. This saves money since most painters typically lay down four or more coats of color when using solvent-based and some other brands of waterborne paints. Even so, Jon laid down two and a half full coats just to be on the safe side.

1306 Using Waterborne Paint Wet Area And Drier Area 13/18

13. With the basecoat color laid down, we let it dry for 15 minutes before moving onto the clearcoats. The main difference between water and solvent is the way the carrier evaporates. With solvent, the evaporation rate is mainly driven by temperature. This is why there are a variety of reducers. High-temp reducers slow the evaporation rate down so that the paint doesn't dry too fast, while low-temp reducers speed up the evaporation rate to make the paint dry faster when the temp drops. With water the evaporation rate is driven by relative humidity and temperature. If the air is drier, the water leaves the paint film faster. Here "desert" controllers slow down evaporation when the air is very dry and standard or high-humidity controllers speed up the process when the air is very humid. With waterborne, air movement is key since still air becomes saturated and slows down the evaporation of the water.

1306 Using Waterborne Paint Let Basecoat Color 14/18

14. While the color was drying in the booth Jon started mixing up the clear. The Axalta Premier Clear is a two-part system that is mixed at a ratio of three parts clear to one part activator.

1306 Using Waterborne Paint Axalta Premier 15/18

15. Three heavy coats of clear later and the body of our Camaro was looking good. This go-round we only shot the body and doors. Later, we'll tackle the fenders and other parts, which will incorporate the graphics designed by Ben Hermance.

1306 Using Waterborne Paint Three Heavy Coats Of 16/18

Sources

Best of Show Coachworks
San Marcos, CA 92069
7604800227
www.bestofshowcoachworks.com
3M Corporate Headquarters
St. Paul, MN 55144
888-364-3577
http://www.3m.com
Chassiworks
Sacramento, CA
800-722-2269
www.cachassisworks.com
Axalta Coating Systems
800-338-7668
http://www.axaltacoatingsystems.com

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