chip douglas said:
shotime,
good post that is yours. Would you mind sharing what is the technique you use with the rotary, to avoid swirling, as that would be ever so convenient ? Also, after you buffed the car, did you wipe it down with a MF 50/50 alcohol/water mix, and then look at the finish under bright sunlight ? As if i didn't wipe the finish after either 83 or 82, the finish would indeed appear flawless.
I find this kind of discussion very tricky, as some with experience claim one cannot get a swirl free finish using the rotary alone, and then others claim they can......now who is telling the truth.
I'm sure you get my point, and I'm honestly confused right now
It's hard to explain because it's more of a feel you develop, but I'll try.
You can get very close to a swirl free finish with a rotory. Unless you can see 100% of the car in direct sunlight, it's hard to tell if there is any. When I work in my driveway, the back end of the car sticks out in the sun, I can see if there's any there, I can't on the hood. Even if you could get one vehicle perfect, the chances of going 100% swirl free on 100% of everything you do is very slim. I feel that following up with a PC is the only way to make sure you've got every swirl possible out of the car.
The biggest part is keeping the pad 100% flat. This may not be possible for some parts of the car and it's ok to use the edge for those.
Always move in a different direction. I start opposite the airflow, then alternate diagonals, then finish with airflow. On a door it would look like this- | \ / -- Each time I change direction I lighten up on the pressure. On the very last pass (final pass of the last product you're using with the rotory) before I move on to a PC, I actually pick up on the buffer a bit to take weight off the pad.
RPM's- I usually go between 1200-1800. I see no need to go above 2000. Experiment with it, see what works best for you.
Clean pads- Always start with a clean pad. Any abrasive bit in a rotory pad will trash a paint job. This is much more important with wool pads because they can hide things. If I use a wool pad, I use it on 4 vehicles and then toss it. It's much more important to have a clean pad with a rotory because of the weight applied to and speed of the pad. I've also never used alcohol inbetween steps, although I do wipe excess off with a microfiber.
Don't be affraid- I treat a paint job on a Ferarri just I would on a Metro. You can't let fear intimidate you. Look at it as polishing paint, not a $250k car.
If you're really serious about learning on a rotory, get a white Edge finishing pad and a light polish (SSR1, #82) and try it out. You're using both a light abrasive polish and pad so burning is at a minimum. Junk yards or a friend with a POS car are good places to cut your teeth on.
This weekend I'm doing some paint work and wet sanding an entire car. I'll do a write up on it and make sure I beg/borrow/steal a digital camera to get some pics. I'll get some pics trying to show what I just explained.