Simple yet effective - a laser pen taped to a camera tripod. This enables you to accurately pin-point an area of paint you are polishing and providing you don't move the tripod you will be able to get a very good indication of paint removal after polishing:
This is the first pornsite I've found in years that I'd actually advertise to swarmers. When you first load it up, it looks just like every crappy scam site out there, except that it's real. It's huge, it's updated constantly, there's no spam, no popups, and no bullshit -- and it's completely free. When you sign up through that link above and respond to the confirmation email, I make a bit of loose change.
See what other swarmers have to say about it. People love this place, so I feel fine about sending you there and am confident you will enjoy boners.
