TDS for Basecoat Question

[Mr Fixer]

Please can somebody who knows, shed some light on this. I’ve recently bought some metallic basecoat, from my local auto paint supplier. The data sheet says to sand between P360 to P600 for substrate preparation. Looking around on here, I believe it is more usual to sand a bit finer to 800 grit for metallics. What would be the reason for a more coarse prep? Thanks.

 

[angellonewolf]

better chance of it taking to the old paint ?

 

[Mr Fixer]

better chance of it taking to the old paint ?

Perhaps, but go too rough with metallics, I think it can show through? I’ll just have to try and see how it looks, I guess. Thanks for the reply.

 

[ajlelectronics]

Perhaps, but go too rough with metallics, I think it can show through? I’ll just have to try and see how it looks, I guess. Thanks for the reply.

You might get away with it, but my routine is 500 for solid 2K and 800 for metallics, all used dry.

 

[bert]

I also go to 800 for basecoat, sometimes 1k if I can still see scratches

 

[Mr Fixer]

Ok thanks, I’ll bear this in mind. I guess the information on the TDS may be inaccurate.

 

[steveo3002]

dont forget dry papers are not the same rating as wet n dry

400 dry =800 wet n dry ....mad as it sounds but its true

i would 800 wet n dry ,4/500 dry for metallic

 

[Mr Fixer]

I’ll see how it turns out on a small test, with the 600 dry. I already have this grade. If I get scratches showing through, I’ll buy some 800 and move up to that. Cheers.

 

[graffian]

dont forget dry papers are not the same rating as wet n dry

400 dry =800 wet n dry ....mad as it sounds but its true

i would 800 wet n dry ,4/500 dry for metallic

P for Production?
I always wet sanded with 600 for solid 2pack and 800 for basecoat.
Some time ago I bought dry paper on Langy's recomendation and used[as he suggested] 320 for solid 2packs and 400 for basecoat.

 

[steveo3002]

P for Production?
I always wet sanded with 600 for solid 2pack and 800 for basecoat.
Some time ago I bought dry paper on Langy's recomendation and used[as he suggested] 320 for solid 2packs and 400 for basecoat.

dont know , i see the P used on dry papers and the wet n dry

 

[MetalMonkey]

I prefer to dry sand to avoid introducing any unnecessary moisture - only wet sand the final top coat before buffing.
I've had good results with 320 discs as a prep for primer coats and 2k solids, then blocking down by hand usually a 400 grit. Metallics probably would be worth going slightly finer. I've used 400/500 on base & clear and its been ok.

 

[vw1]

Epoxy , filler , upol primer 400 / 600 wet sand then matalic finished off with upol clear. Done this last week.
No underlying problems scratches etc.

Wet sanding was done outside last week , let it bake in sun for few hours before spraying.

This is my own car and I'm just a hobbies not a pro.
Just showing an example of my work.

 

[steveo3002]

another polo eh , i did the passenger side on mine last week

 

[vw1]

another polo eh , i did the passenger side on mine last week

Yes and a gt breadvan