Just a quick question about paint preparation.
I,m painting my car 2 pack solid white .....
anyway I have rubbed the under coat back with 800 wet-dry
And I have been told that it is too fine for The top coat to stick.
So is it to fine ?
Or have done it right ?
Some guidance would he hugely appreciated :)

primer ? or undercoat paint ? i would have just rubbed primer back with 320 soft back pads then layed an undercoat on let it flash off then keep coating till you get the desired finnish. iv never sanded between coats. but im not a panel beater just a backyard hack

600 wet-dry would have been better but is will still stick

It's primer sorry not under coat :P

its fine to lay colour over 800 wet-dry rubbed primer.

Thanks ..I thought it would be fine Haha

When rubbing 2k primer, you will need to rub it with something more coase 1st to flatten it off and remove imperfections, this is where the guide coat comes into it, then use something finer to remove the scratches.
Thiers many ways to do this
For 2k Solid either block by hand with 240 dry or 400 wet, or use a sander with a soft pad with 320, then 600 to remove scratches. Only basecoat requires 800 wet to finish it off as base coat shows up scratches,
But 800 on its own as you said will not be coarse enough to flatten it off properly, is also very time consuming.
Altho solid white hides everything!

^^^ i agree solid 2k colour.240-320 free cut dry.guide coat wet rub 600,scothbrite edges and paint it

Thanks for the info ...the ute got a quick buzz back and painted today....looks good except my prep work was prity crapy :P ..I just want to get it on the road now .

just make sure you're using 2 pak compatible primer before you apply any paint or else you'll have problems.