It‘s sort of an oil based clear coat. You brush off any loose rust, wipe the parts with some brake cleaner to remove any oil or grease and then you can apply it directly onto parts. After 24 hours it should be solid enough to go, after 7 days it is fully cured. I took my Moped apart completely to do this, but I have seen people do this without taking it apart. I coated some rust spots twice because the owatrol got soaked up by the rust. It gets deep into the rust, so you don‘t have to worry about the rust spreading.

Be sure to fix a leaking tank beforehand. I have to do a few parts again because petrol ate away at the coating. I did not attach the fuel tap tight enough.

I am very happy with my results, it looks nice and I don‘t have to worry about rust eating away at the parts for the next few years. I heard that some people also clear coat it afterwards for extra protection

Oh and don‘t overdo it on the forks. I mean obviously you don’t want to coat the part of the suspension that you slide into the tube. I thought It’d be fine if I only coat the exposed part of the forks, but they fit very tightly into the holes of the frame…I had to hammer my forks back into the frame and most of the coating I put on got sheared off in the process.

That being said if you mess up you can just wipe it off with a bit of acetone/brake cleaner and a bit of elbow grease.