I have had this primer on my hardtop, for the last 35 years; it’s never been washed. Just dusted or wiped down with a damp towel.
A friend of mine had a dark gray/black primer pickup. He would spray WD-40 on it and wipe it down after washing gave it a semi-gloss look. Always looked pretty good and clean. Your mileage may vary!
Because the hot sun can dry the water spots quickly which can bake the water mineral deposits into the paint.
Obviously no plans painting it without some type of soda blasting to completely strip the body to bare metal to rid the WD40 residue. Still some risk of repainting issues.
Wash it and then rinse it thoroughly keeping it all wet then get in and hit the highway until dry… No water spots.
Probably not IMHO completely if he’s done it that way for years and with sun exposer WD 40 ( petroleum base) permeates the paint. It only takes a tad for the paint base to not set up right for the top coat and cause bubbles / wrinkle due the a chemical reaction. ( not adhering together.) Top coat is only as good as the bottom coat.
If you've rubbed down your car with something oily like WD-40 for years, there's no guarantee that was and grease remover will catch everything. Especially in hard to reach areas. An acquaintance bought an early 70's muscle car nearly 2 decades ago. It had heavily dulled paint, but otherwise looked good. He rubbed it down with transmission fluid and it gave it a bit of a shine. I don't know if any of the guys that owned it after him tried to paint it, but I feel for them if they did.
From the webbs. Any resemblance to a live idea or a dead one is purely coincidental......... "To prevent water from beading on car paint, you can add a wetting agent to the water. These agents, often found in car wash soaps and detail sprays, lower the surface tension of the water, allowing it to spread out more evenly instead of forming beads. This can help prevent water spots and make the drying process easier. Here's why and how it works: Surface Tension: Water molecules are attracted to each other, creating surface tension that causes them to bead up on hydrophobic (water-repelling) surfaces. Wetting Agents: These additives reduce the water's surface tension, allowing it to spread out and wet the surface more effectively. Sheeting: When water sheets off a surface, it flows off evenly, rather than forming individual beads. This is desirable in some situations, like when drying a car, as it reduces the chance of water spots. Examples: Many car wash soaps and detail sprays contain wetting agents designed to promote sheeting. In addition to using wetting agents, you can also take these steps to prevent water from beading and potentially causing spots: Dry the car thoroughly: This is crucial, especially after washing or rain, to prevent water from evaporating and leaving behind mineral deposits. Consider a water softener or deionized: These can help remove minerals from your water supply, reducing the likelihood of water spots. Apply a hydrophilic coating: While most coatings are designed to repel water, some are specifically designed to be hydrophilic (water-loving), encouraging sheeting."
The Jalopy Journal
