Projects Will this leave sand scratches?

I blocked my primer to 320 and want to make sure I don’t get sand scratches on the top coat which is semi gloss black urethane. Will this be fine enough??

Thanks -Abone.

 

What grit equivalent is it?
I generally stop at 400 on single stage but will finish with 500 for black

 

That is the unknown part, what grit is “superfine”?

-Abone.

 

Sand primer with 400 grit prior to painting.
Some folks let the body work sit for a week or two after priming to avoid shrinkage
problems later on.

 

Superfine sanding sponge google search:
3M Softback sanding sponge uses aluminum oxide as the abrasive material. Comes in a super fine abrasive grade. 3M incorporates this aluminum oxide material into the sanding sponge forming a grit of 500 to 600. The sanding sponge has a width of 4 1/2 in and length of 5 1/2 in.

https://www.rshughes.com/p/3M-Softb...D_BwE&ef_id=WnhndQAABMekyKAC:20180910220808:s

 

I'd bet "superfine" is finer than 320
Don't use products without knowing exactly what they are. Costly mistakes can result. That sounds like a home improvement store product.
I suggest 400 followed with sealer.

 

Ah Ha!! 500-600 grit was the number I was looking for, not sure why I wasn't smart enough to find it.

Thanks, -Abone.

 

I did the edges of the engine cover of my V8Corvair. I sanded them with a red 3M scrubby pad...…….pretty coarse. I used duplicolor trunk paint on the edges. You can't see any scratches in the paint

 

Nope, definitely a body shop product, quite handy actually


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Those sponges are great for sanding louvers and fine details!