wet/dry sand paper

[pflaming]

At what stage of paint prep does one go to grits higher than 320? 

[40plyrod]

I go from 36 to 80 to 180 for filler work. Then 220 to 320 and 400 to block the primer. I use 400 and 600 grit to scuff a top coat if I'm going to respray. 800 to 1000 and 1500 to wet sand before polishing out the clear.

[48Dodger]

The way you're doing things Paul have to be looked at different. 

You're taking the exsisting paint, sanding it, then shooting a clear over it.

 

The orginal paint is not a good substrate...it doesn't have the strength of primer. As you sand it, the paint become thinner and subject to reacting to the solvents in the clear. I'm assuming you are either brushing on clear or using a rattle can. I would suggest you sand with nothing more than 320. The higher grits will feather the edges and make it weak.

 

When you done with the clear......I would say to only buff it....it will be to thin to cut it.

 

48D