Should I block sand the primer after each coat or should I do the recommended 2-3 coats first? If I find a low spot while sanding, how do I fill it? Do you need to sand the primer back down to metal before glazing the low spot?

Also, should I tack rag after each coat or just wait till all the coats are on?

 

when applying high build primer such as k38 which is made by ppg the best way would be to apply 3 coats at once following the recoat times (5 mins between coats i belive but make sure) then guide coat it with a light fog of sem guide coat black then block with 150 grit to get all low and high spots even if you have any extremley low spots get some polyester glazing putty that can be appliued onto any catalized painted surface. if you have to use any glazing putty then apply 2 more coats and block with 320 then wetsand with 600 then 1000 if u want it to be extremely smooth but 1000 is not nessarcy if you dont have to use any glazing putty apply 1 more coat then sand wiith 320 and 600

 

It kinda depends on how long you wait between coats. I've found with rattle can primers that it's better to use a tack rag after I've sprayed my few coats b/c I don't wait a full 30 minutes for the primer to dry. If I sprayed a coat, waited 5 mins, and then used a tack rag, I'd be pulling up primer.

But if you do wait the full dry time between primer coats, then yeah, you should tack rag between coats.

I believe the same goes with color coats, too... if the paint is still wet-ish, you shouldn't use a tack rag. I know House of Kolor - and presumably other paint companies - recommend spraying second and third paint coats when the original coat reaches final tack (very slightly sticky)... so using a tack rag would ruin the paint-job-in-progress.

Don't forget about using compressed air to blow any dust out from door jambs and wheel wells and window weatherstripping and etc..

 

words of advice dont use rattle can primer!! if u want a professional looking job spray it with a gun

 

This is professional advise. It's the method I use, and the method my dad has used for 15+ years at our shop.

For the love of ***, stay away from rattle cans!

 

thanks davie i take that as a compliment

jus thought itd be intersting to see wut anyone thought of the fact that im only 16 well 17 today (happy b-day to me) lol