Maroon scuff pad / metallic base
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I always hear don’t scuff your primer with a maroon(red) scuff pad (3M scotchbrite) if you’re spraying a metallic base, use a grey one in that case. Is this rule for waterborne only or also for conventional thinner bases?
I’ve just read a House of Kolor TDS and they say to use maroon with their (conventional) metallics.(see: http://www.houseofkolor.com/PDF/TechData/English/BC_FBC.pdf )
How are your experiences with maroon and metallics, will it show scratchmarks in the basecoat?
If you seal it you will be fine,personaly I wouldn’t base over red scotchbrite.
A maroon scuff pad is like 320 grit. base a solid color over 400, 600 grit for metallic colors. Grey scratch pad is like 800 grit so IMO is not coarse enough to sand primer, why not just use a sheet of sand paper cut in 4 squares in the correct grit for each task?
It all depends on how you use the pad presure etc. also some primers are softer than others for example Standox pf primer is recomended to be sanded at a higher grit than standox hs system filler. Also keep in mind that the Axalta line of waterborne paints eg. Standox and spies are thicker and can actually take a heavier scratch than solvent.I myself will not use a red scotch pad on primer.
Using paper is difficult in my case (hard to reach places), and a grey pad doesn’t do much on the primer i use, that’s why i asked this.
And what about starting with maroon, and finishing with grey? Maybe this could work.
Btw, the question still remains why House of Kolor seems to have no problem with using maroon before spraying metallics. 😉 I can’t believe they would write that if it would leave scratchmarks.
Quote from Shimrin metallics TDS:
4. SANDING THE SUBSTRATE
• Ko-Seal® II (see tech page on Ko-Seal® II)
• SG100, Cured Top Coat Clears & OEM Finishes (artwork only)
• Dry Sandpaper = 280P to 320P grit (CAMI grade = 240 to 280 grit)
• Wet Sandpaper = 400 to 500 grit (FEPA grade 600P to 800P grit)
• Maroon scuff padI use a red mirka scuff pad on blend panels,primer and i have with solvent and water with no issues on metallic or soilds the only thing i use a gray scuff pad for is a raw bumper
Red will scratch glass. To my way of thinking that’s way too coarse to go under base.
I don’t believe that you should be using Scotchbrite to “sand’, Anders. Sandpaper, wet or dry changes the surface from rough to smooth and flattens. Scotchbrite does do that – it just puts in scratches which are fine for adhesion but no good if you want to actually flatten the surface which is what you do want to do when sanding primer – take out peel and surface irregularities.
[quote=”smooth” post=31776]A maroon scuff pad is like 320 grit.[/quote]
According 3M it’s 360-400.
http://autobody101.com/scotch-brite-grits.pdf
[quote=”Anders” post=31791][quote=”smooth” post=31776]A maroon scuff pad is like 320 grit.[/quote]
According 3M it’s 360-400.
http://autobody101.com/scotch-brite-grits.pdf%5B/quote%5D
Sorry, I should have been more specific, I use Norton #747 maroon pads, they are just as good but cheaper…
Nft5 had a good point a scotchbrite pad will not actually sand or flaten, it will only scratch the only place I could see one being used on primer is in very hard to reach spot like a foglite hole in a bumper that would in my case probabaly be sealed anywase. NO DOUBT IN MY MIND IF YOU TOOK A RED SCOTCHBRITE PAD AND DID A STRAIGHT LINE SAND SCRATCH DOWN THE MIDLE OF A SILVER DOLAR METALIC DOOR YOU WILL HAVE SAND SCRATCHES SHOWING. I think it all depends on how the pad is yoused and were it is used.
I was always told a red scotchbrite is for 2k solid colours and grey for under base.
But like has already been said I only use them to scuff existing paints for adhesion not for flatting.We use the carbo red for scuffing everything. That is more like the 3m grey. Cheaper & effective.
Something we have been using lately are the 3m flexible hookit hand sheets. They do a really nice job for getting into tight places and actually sand instead of scuff. I’ve only tried the 600 and 800 grit but there’s also 400,1000,1200,and 1500.
grey carbo pads are where its at. they create a much more even/ consitent scuff and last much longer.
I’ve been use red pads for years and basing over even metallic blends. It’s all about how u use it. I also use scuff stuff.
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