What grit sandpaper for sanding Squandron green putty ?

Thanks eveyone ! I have been using 320 garnet

and 1000 silcon carbide for that putty, so far

so good. The sanding scratches do not show

through the pimer coat that I can tell.

I have a couple of sets of needle files- a regular sized set and a small micro set. I find these great for the initial smoothing of putty and seams. I just finish up with fine sandpaper but the files take it down to that point very quickly and accurately.  Putty does clog the files periodically but I bought a brass wire brush and it cleans them fairly easily.

EdGrune

I knock the majority of the putty down with a Sally Beauty Supply fine nail stick, then go back over with an extra fine nail stick to complete the sanding.  These can be used wet. Then finish up with a nail buffer which has hardly any grit at all.   Polishes and removes any remaining scratches. 

These nail sticks have a plastic core with foam backing.  They can be scored with an Xacto knife and snapped off to be cut/shaped as needed to fit into fine spaces

I will lay a couple of strips of masking tape along the seam to be filled, leaving a 1/8-inch or finer gap between them.    Fill the seam with putty, smooth,  and allow to dry.  Once dry, I sand with the fine stick before removing the tape.   The tape protects the surrounding detail.   Progress to the x-fine grit and sand out any scratches.   Pull the tape - there may be some ridges along the edges.   Sand them down with the x-fine stick.  Then polish with the buffer stick

 

I knock the majority of the putty down with a Sally Beauty Supply fine nail stick, then go back over with an extra fine nail stick to complete the sanding.  These can be used wet. Then finish up with a nail buffer which has hardly any grit at all.   Polishes and removes any remaining scratches. 

These nail sticks have a plastic core with foam backing.  They can be scored with an Xacto knife and snapped off to be cut/shaped as needed to fit into fine spaces

I will lay a couple of strips of masking tape along the seam to be filled, leaving a 1/8-inch or finer gap between them.    Fill the seam with putty, smooth,  and allow to dry.  Once dry, I sand with the fine stick before removing the tape.   The tape protects the surrounding detail.   Progress to the x-fine grit and sand out any scratches.   Pull the tape - there may be some ridges along the edges.   Sand them down with the x-fine stick.  Then polish with the buffer stick

Thanks Don !

I consider 800 a bit too fine.  I generally use two grades- 320 or 400 for initial smoothing and shaping, then 600 or 800 for removing the scratches. I find using just the fine grade takes too long, and it isn't that much of an effort just to switch grades at the proper point.