Advice required on obtaining good spray paint finish
Discussion
Hi guys, hope this is the right section.
Just spraying up my GT spoiler for the M3 and looking at advice on getting a good and consistant finish.
Ok, so sprayed it matt black to contrast nicely with the yellow. The paint finish looks excellent,much better than I expected, really took my time with the prep, no runs, blemishes etc. Problem is it feels rough by hand. I did sand between primer and colour with 800 grit. So I started to rub the underneath (as a test) with 1200 wet and dry, lubricated with water & fairy, (can you tell I've been reading online?), problem is even with 1200 grit, I can see slight sanding marks, swirl marks almost, but it's really smooth to feel. But unsure how it ill take to cleaning, water marks etc. And if I'm honest it's perhaps a little too matt, maybe should have went with satin to match the bumper strips, diffuser etc...
So, I decided to try polishing a "sample" section, without sanding first, still feels a little rough though. Also it's now shinier (not a bad thing), but it looks uneven, some bits shinier than others. Not good. I'm using micro fibre clothes to polish. Should I be using something else?
Then I tried T-Cut, but it's just had the same effect, in fact I can see little dimples :? of different paint colours, although the paint is little smoother. Just doesn't seem to be a happy medium.
So what's the secret :?: :?: How how about rubbing down with 1200 again and going over it with satin black, then it should be fairly smooth so no need to rub down, but brighter. Win win??
Thanks in advance.
G
Just spraying up my GT spoiler for the M3 and looking at advice on getting a good and consistant finish.
Ok, so sprayed it matt black to contrast nicely with the yellow. The paint finish looks excellent,much better than I expected, really took my time with the prep, no runs, blemishes etc. Problem is it feels rough by hand. I did sand between primer and colour with 800 grit. So I started to rub the underneath (as a test) with 1200 wet and dry, lubricated with water & fairy, (can you tell I've been reading online?), problem is even with 1200 grit, I can see slight sanding marks, swirl marks almost, but it's really smooth to feel. But unsure how it ill take to cleaning, water marks etc. And if I'm honest it's perhaps a little too matt, maybe should have went with satin to match the bumper strips, diffuser etc...
So, I decided to try polishing a "sample" section, without sanding first, still feels a little rough though. Also it's now shinier (not a bad thing), but it looks uneven, some bits shinier than others. Not good. I'm using micro fibre clothes to polish. Should I be using something else?
Then I tried T-Cut, but it's just had the same effect, in fact I can see little dimples :? of different paint colours, although the paint is little smoother. Just doesn't seem to be a happy medium.
So what's the secret :?: :?: How how about rubbing down with 1200 again and going over it with satin black, then it should be fairly smooth so no need to rub down, but brighter. Win win??
Thanks in advance.
G
Edited by scz4 on Sunday 4th April 20:35
The final result of any spray job is only as good as the prep work that went into it.
If you had visible sanding scratches on the primer then you will have the same visible sanding scratches on the finish, only they will be bigger!
If your sanding of the topcoats shows different colour then you've probably sanded through to the texture of the underneath coats.
Did you use aerosols or proper spray equipment? Heavy uneven coats of matt or satin can give a glossy patchy final finish & aerosols can be particularly bad. The felt roughness can also be down to technique(eg texture) & the type of paint.
If you sand the final coats you will have sand scratches - even with 2000grit. Finer grades are available as pads incl 3000 & 4000grit but you will still need to compound to get these out & polishing a matt finish does rather defeat the object.
Either sand it smooth - try 1000w&d - & do it again being careful with your spraying technique or get a professional to do it for you.
If you had visible sanding scratches on the primer then you will have the same visible sanding scratches on the finish, only they will be bigger!
If your sanding of the topcoats shows different colour then you've probably sanded through to the texture of the underneath coats.
Did you use aerosols or proper spray equipment? Heavy uneven coats of matt or satin can give a glossy patchy final finish & aerosols can be particularly bad. The felt roughness can also be down to technique(eg texture) & the type of paint.
If you sand the final coats you will have sand scratches - even with 2000grit. Finer grades are available as pads incl 3000 & 4000grit but you will still need to compound to get these out & polishing a matt finish does rather defeat the object.
Either sand it smooth - try 1000w&d - & do it again being careful with your spraying technique or get a professional to do it for you.
Edited by paintman on Sunday 4th April 21:03
as with all matt or satin finishes they wont take any post paint rectification be it de nib, flat or polish.
If you want the "stealth" look and are adamant you want to use rattle cans, preparation is king, and whilst you are painting make sure your in a ventilated area with NO dust or pollutants floating about in the atmosphere, dampen the floor down if its concrete, making sure threes no electrical cables close
And probably another couple of good tips are heat the cans up before use and soak the nozzles in gunwash or thinners. these pointers should help to alleviate the "gritty" effect your getting in the paint.
Other than that just make sure it gets a good even application of the base coat.
If you want the "stealth" look and are adamant you want to use rattle cans, preparation is king, and whilst you are painting make sure your in a ventilated area with NO dust or pollutants floating about in the atmosphere, dampen the floor down if its concrete, making sure threes no electrical cables close
And probably another couple of good tips are heat the cans up before use and soak the nozzles in gunwash or thinners. these pointers should help to alleviate the "gritty" effect your getting in the paint.
Other than that just make sure it gets a good even application of the base coat.
scz4 said:
Thanks. Yeah just using spray cans.
As I said no marks, scratches etc on the parts I've not touched, so prep work is all good. But everything else I try to make the paint feel smooth just creates the inperections.
spray cans lol ok what did you think you woz gonna do a custom paint job after going to halfords to get sum yellow paintAs I said no marks, scratches etc on the parts I've not touched, so prep work is all good. But everything else I try to make the paint feel smooth just creates the inperections.
Sounds like what you were getting are called 'nibs'. Basically dust & bits in the paint going onto the surface.
Sand & then polish is the way to deal with them.
Have a look here http://corporateportal.ppg.com/refinish/maxmeyer/e... under the heading 'Dirt nibs'
Sand & then polish is the way to deal with them.
Have a look here http://corporateportal.ppg.com/refinish/maxmeyer/e... under the heading 'Dirt nibs'
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