Hook & Loop (Velcro) Sanding Disks are ideal for creating a smooth, even surface prior to polishing. Sanding with progressively finer grits will help to hide pits, scratches & burns to help attain a flawless, mirror-like finish. These discs are designed for polishing both aluminum and stainless steel and are available in 120 grit, 180 grit, 220 grit, 320 grit, 400 grit, 600 grit & 800 grit.
A good rule of thumb when sanding aluminum or stainless is that you should always start with the least aggressive grit possible to get out the imperfections that are on your workpiece such as your gas tank, alcoa wheel, bumper, fender etc. As an example, if you want to get out pits or scratched from a tank, you should first start with a less aggressive grit like 220 or 320 and see if that will get your initial scratch out. If it does then great, less work for you and you can now progress now through the stages of sanding. If it doesn't, go a grit lower to a 180 and see if that gets it out. It is very rare, other than in very bad cases that polishers will need to sand down to a 120 grit or coarser.
A good rule of thumb when sanding aluminum or stainless is that you should always start with the least aggressive grit possible to get out the imperfections that are on your workpiece such as your gas tank, alcoa wheel, bumper, fender etc. As an example, if you want to get out pits or scratched from a tank, you should first start with a less aggressive grit like 220 or 320 and see if that will get your initial scratch out. If it does then great, less work for you and you can now progress now through the stages of sanding. If it doesn't, go a grit lower to a 180 and see if that gets it out. It is very rare, other than in very bad cases that polishers will need to sand down to a 120 grit or coarser.