blocking grit sequence?

S

ShaunD

I am a newbie having never painted a car before. I just want to make sure that I am doing things right. I did all of my body work and filler work and smoothed everthing out with 80 grit. I am ready to move on to blocking.
I will next apply my SPI 2k primer. I am wondering what grit sequence I should use. I will be using prospray basecoat and spi universal clear when I am done. I am thinking about using 220 grit, followed by 400 grit. I then will be sealing up all of the body work with spi epoxy reduced slightly. Then base over top of that. Is my sand paper sequence ok to do or what would you suggest. again my body work was done in 80 grit. do I need more steps between base coats and do I need to go finer than 400 before spraying the epoxy sealer and then base coat.
When blocking the car out I intend to spray 3 coats of spi gray 2k and then 1 coat of spi yellow 2k in to use as my guide coat. Once I have this sprayed I will block it down moving my way through the grits. Do I need to spray anymore primer between grits or no and again is my grit sequence ok or should add some grits. please suggest a sequence. Thanks in advance for all of your help and answers. You guys have been awesome!
 
Your bodywork should be finished to 180 grit minimum before shooting any primer. 220 for primer blocking is OK, finishing with 400 grit is OK for solid colors colors-600 works for all.
 
so get everything to a minumum of 180 and then shoot the primer. from there if I went 220 and then 400 and then 600 I should be ok for everything correct? Do I need any intermediate steps in the grit? 180-220-400-600 and then shoot the epoxy sealer. I am painting the car gm lemans blue which has some minor metallic to it. does this sound ok. thank you again for your reply
 
I like to finish any thing i do with 600 dry on a da with a soft interface pad. With wet sanding some times u get scratches if you pick up some trash while your sanding. If you finish like that you wont need to seal it with anything. Unless u have alot of break thru's. If thats the case then seal.
 
Usually I start with one or two coats of Turbo, block with 100 and recoat as necessary. After everything is blocking evenly, then 180 and so on. Fine sand paper too early = waves.
 
ShaunD;8087 said:
so get everything to a minumum of 180 and then shoot the primer. from there if I went 220 and then 400 and then 600 I should be ok for everything correct? Do I need any intermediate steps in the grit? 180-220-400-600 and then shoot the epoxy sealer. I am painting the car gm lemans blue which has some minor metallic to it. does this sound ok. thank you again for your reply
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Make sure your last sanding session before paint is with 600 grit for that blue metalic-this way you know there will be no scratches showing in the basecoat-assuming you'll be using basecoat/clearcoat.
 
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