If your working on a car. This is the final step if you did body work on a car befor painting
For pure sanding of bondo or metal, No. If you are preping to paint or sanding primer you should use Wet or Dry sandpaper and sand wet.
Wet sanding a boat hull has the effect of making it as smooth as possible. Not only does this improve the appearance, the boat uses less fuel.
Wet sanding may remove some glues in someconditions. However I've found dry sanding more effective with most adhesives. It depends very much on the exact 'glue' in use here.
Yes, but only if the joint cement is still wet.
Dermabrasion
You really could do either or neither. If your using an epoxy primer sanding is not necessary. If not you could wet or dry sand whichever you prefer. Wet sanding makes for a smoother texture finish and less dust of course.
You can try wet sanding the rough areas.
You can't without sanding it. -I have done this but it's very tricky and means sanding with finer and finer grades of Wet 'n Dry till 1200, then plastic polish after that.
Wet sanding new paint on a car is very important if you want to get that paint to look it's best, having a glassy smooth look and feel! Wet sanding is meant to flatten and level out new paint, remove small runs or sags, remove surface debris that landed on the paint while it was wet, flatten out orange peel along with minor pot holes, which are called "fish eyes," within the paint. Rubbing compound is applied after a wet sand to bring the color of the paint back to life before clear coat or "Silicone Free" glaze applications. NOTE: You should not apply any wax until the paint has had 60 to 90 days to completely dry and get hard. ~someone els
what is meant by the term catheterisation
What is meant by the term resistivity?
The wet part.