Learning to Paint: Cut and polish

February 11, 2021 / SV Gimme Shelter / Leave a comment

I only had an 18-hour window to apply clear coat after the last coat of color to ensure adhesion. However, I needed to wait a minimum of 24 hours after spraying clear before I could start the cut and polish process.

The clear coat brought out the color of the black cherry paint, but it had noticeable texture. I also had two runs on the air cleaner lid, which were easy to see, but very hard to photograph.

While I had plenty of lower grit sandpaper for paint prep, I hadn’t thought about the grits required for the polishing process. I made a run to my local True Value, but the finest grit they carried was 320. Thankfully O’Reilly’s had a full section of polishing supplies, so I purchased 1000, 2000, 3000, and some polishing compound.

Because I needed to remove the two runs in the clear, I started the process with 600 grit dry sanding. Once I got a cross hatch pattern across the entire surface, I rinsed the lid and sanded with 600 grit wet. I did another rinse, then sanded 1000 grit wet. Then I went to 2000 grit wet. Then I used my random orbital sander for 3000 grit wet. Then I finished the lid with a buffer and polishing compound.

The difference in depth, shine and texture was amazing. I still had some unwanted texture in the grooves, so I actually repeated the entire 600 wet through buffing again. The lid looked fantastic.

I was actually using the air cleaner before this project started, so I was anxious to get it back on the car. I tackled the bottom of the assembly next. I decided to forego the 600 dry sanding portion and just start with the 600 wet. By the time I finished, I could barely move my arms. I don’t think I’ve done this much intense sanding and polishing in my entire life.

I got the air cleaner back on the car, and I decided to tackle the valve covers and oil pan later.

The biggest lesson learned is that preparation is everything. My paint is smooth, but if you look down into it, you can see that the surface of the metal is not. There was quite a bit of pitting in these old rusted parts, and I should have done more sanding before the primer and more coats of primer to smooth it all out before the color coat.

Here’s a side-by-side example of the difference the cut and polish makes.

I do have confidence that I can tackle painting the entire car with the turbine sprayer and get an acceptable result. However, unless I fix some of the underlying alignment and body issues first, it’s just putting lipstick on a pig.

Learning to Paint: Applying clear coat

February 10, 2021 / SV Gimme Shelter / Leave a comment

I spent an entire morning sanding down the color coat I had applied the day before to remove all of the cardboard and plastic that had stuck to the paint when I flipped various pieces before they had cured. I had previously sanded it all with 400 grit, but this time I wet sanded with 600 grit to get a better finish.

I dug out some wire hangers and worked out a new tactic for the my second attempt at color.

I mixed, re-mixed, and then mixed the color again hoping it would be more red this time around. It looked the same as it had before.

Once I had two nice coats of color back onto the parts, I let them cure for an hour, and I prepped for clear coat.

The Eastwood Clear mixes 2:1, so it’s a bit thicker than the color and base coats that mix 4:1. In the future I think I would add reducer when using it with the turbine sprayer.

The Eastwood instructions only call for two coats of clear, but the Kindig It Paint with the Pros instructions call for five coats of clear. It was going on really thick and really clouding up the air in the garage, so I quit at three coats. There really had been virtually no overspray with the base and color coats, but even using the low VOC activator in the clear coat, it was creating serious fumes. People walking their dogs along the street were coughing as they passed the house.

The first coat went on really well and made the color shine, but the second and third coats went on cloudy and had me worried. Thankfully, they dried clear.

I gave all of the parts plenty of time to cure before touching or moving them this time. I’m proud to say that after having to prime twice and shoot color twice, I got the clear right the first time.

I would have liked less texture in the final project. I think reducer would have helped. As I analyzed the parts in the light, I thought, it’s not TERRIBLE, but I wouldn’t have paid for this job. However, it can only get better after the cut and polish.

Learning to Paint: The first attempt

February 5, 2021February 5, 2021 / SV Gimme Shelter / Leave a comment

In September 2019, back when the world was normal, and we jumped on airplanes to breath up each other’s exhales without thinking twice, Mary and I made a trip to Salt Lake City.

During that trip Bryce Green and Freddy Carlson taught us how to paint.

When you have pro equipment being set up for you in a climate controlled spray booth with two of the best painters in the world coaching you, it’s hard NOT to paint well. Recreating that magic in my garage has proven to be more of a challenge. I didn’t really have the space or want the noise of an 80 gallon compressor. Additionally, I was going to have to install multiple moisture traps along the walls. I decided to take a chance on an Apollo 5-stage turbine sprayer.

Allegedly it delivers a continuous 9.5 psi of dry air, and it has a nice HVLP gravity fed gun similar to the SATA guns we used during our class. It’s fairly quiet, and I can spray anywhere there’s a wall plug. I’m hoping we can spray varnish and maybe even gel coat on the sailboat as well.

When we learned the Kindig It paint method, it started with bare metal, then epoxy primer, then filler, then polyester primer, then 2k urethane primer, then sealer, then basecoat, and finally clearcoat.

First off, I’m on a budget. Second, I don’t really have the time or energy to take the Cougar all the way down to bare metal. For my test run, I decided to see what would happen if I sanded the parts, used a little rust encapsulator where necessary, then jumped straight to a 2k primer.

By the way, I never thought I’d have a favorite sandpaper, but I ordered several rolls of Indasa paper from Big Kid Blocks, and I have to say, I love Indasa sandpaper. It is so much better than whatever I usually grab at the hardware store. I also highly recommend their Show Gun cleaner and AngelWax products.

All of the engine parts for this test were giveaways from various members of the Southeast Texas Cats Mercury Cougar Club. The valve covers were from a 68 Cougar. The oil pan was from a 65 Mustang. All of the pieces had different color paint and varying amounts of rust. I cleaned them with a wire wheel, but the gold paint on the oil pan was especially stubborn. I gave it all a spray with rust encapsulator, then sanded with 220.

I emptied all 22 ounces of 2k primer onto the parts. At times I felt like I had the gun spraying well, but at times it felt like I was barely getting any paint out at all. I was using a 1.5mm nozzle, but I think I probably needed a 1.8mm. (Unfortunately, I haven’t purchased a 1.8mm.) I kept turning the air pressure up, but in fact, I probably needed to turn it down to increase paint flow.

When the primer dried, it had a very rough texture. It smoothed out easily with 400 grit, but sanding won’t be an option when I get to the color coat.

I finished sanding, wiped it down with paint prep, then re-assessed. The coverage had become a little thin in some places, and there were a few spots showing bare metal.

I decided that instead of moving on to the base coat, it would be better to troubleshoot my issues and try another coat of primer. I’m going to spend more time adjusting the gun and increase the amount of reducer for better flow. Hopefully I’ll have time for attempt number two before the weekend is over.