Guide coat

[Coronet 14]

When sanding the guide coat to find high and low spots what is the best grit sandpaper to use I trying my hardest to do it right Thanks

 

[747mopar]

I use 220 grit with the understanding that I'll be hitting it with another coat of primer and then blocking it out with 400 for sealer and paint. You just want to make sure your no coarser than 400 with your final sanding, most will say to go even finer for the final round but I like as much bite as I can get and still be able to cover. Hope this helps

 

[chad]

I use 180 to cut through it quick, then run over it with 220 to smooth her out a little more , then 3 more coats of the primer of your choice, guide coat again and hit it with 400 and you should be good to go. But black cars I do 3 or 4 rounds of blocking just to be safe

 

[Coronet 14]

Thanks guys

 

[chad]

I forgot to mention I like the powedered guide coat better. It doesn't clog up the paper like some of the paint/primer guide coats

 

[BarrsRestoration]

It depends on what is under the primer and what grit it was sanded with before priming. Filler underneath or metal? Is it the first prime coat over filler?
Lots of variables make a difference as to what you need to start. Finishing with 320 or 400 is fine if the surface is ready for it. Just don't expect to level/troubleshoot primed filler work or eliminate 80 grit scratches with 400.