What grit to use???

[5.7 hemi]

At what grit do you call it quits when getting ready for paint? In other words, your final blocking grit.

 

[Donny]

1000 grit or 1500 grit? It's been many years since I last painted a car.

 

[alleyoopmgv]

Depending on the color, my final sand is with 600 for most colors. I go to 800 if it's black.

 

[5.7 hemi]

Thanks fellas, this gets me going in the right direction.

 

[66_B_Body4ever]

600 is the finest you should use for all colours with the exception of tri-coats and light mica/pearl colours. Too fine and you lose mechanical adhesion which leads to delamination. It is advisable to paint over the primer surfacer sooner (within a few days if possible) rather than later which helps provides a chemical bond as well to the paint. 800 grit for tri-coats...These are P-grade ratings, not Cami...big difference between the American Cami system and FEPA's P-grade which is the European system and is generally more common.

 

[roadrunnerman]

just askin, does it make any diff if you wet sand or dry sand b4 paint?

 

[5.7 hemi]

good ?.

 

[66_B_Body4ever]

Read the tech document on the primer-surfacer that you are using. Some are not supposed to be wet sanded as they will retain moisture. Case in point would be PPG's NCP.