How to flatten SPI black primer?

G

GumbosPop

New Member
Newbie question, I'm shooting the engine compartment on my 1970 Mustang. I've sprayed red oxide, then build primer. The red oxide on the front of the radiator support is a little too shiny, and I'm going to be shooting some black epoxy primer over it (which will be final coat). Is there something to add to the primer that can dull it down somewhat. Less than semi gloss, but a little more than satin....

Thanks for all replies.

Walt
 

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I'd use SPI Flat Black 2201 if you are wanting a consistent gloss level. It's possible to flatten SPI epoxy by reducing it, but I have found the results to be inconsistent and difficult to repeat. The Flat Black can have it's gloss adjusted by varying the hardener ratio, and is forgiving and the most repeatable flattened product I have used, for example if you want your underhood too look like your engine bay without hassles, use the Flat Black, since those pieces will probably be painted at different times.
 
Crash, Thanks for responding...It's a Saturday and I'm less than impatient and SPI is closed. When you say reduce the epoxy, what do you mean by that? Add more activator?

As mentioned...a newly here...so your insights are appreciated. On this particular part of the car I'm not too concerned about repeatability. It will be behind the condenser, grille, etc.
 
GumbosPop said:
Crash, Thanks for responding...It's a Saturday and I'm less than impatient and SPI is closed. When you say reduce the epoxy, what do you mean by that? Add more activator?

As mentioned...a newly here...so your insights are appreciated. On this particular part of the car I'm not too concerned about repeatability. It will be behind the condenser, grille, etc.
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No, with epoxy the mix never changes, it's always 1:1. Only the Flat Black has a variable hardener ratio, it is the ONLY SPI product with this feature.
If I was you I'd just spray it as Don says. If you really want it with lower gloss, try adding 25% urethane reducer like 885 to the premixed, ready-to-spray epoxy.
 
GumbosPop said:
Less than semi gloss, but a little more than satin....
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That's black epoxy right there. It ain't semi gloss but it's not satin either. Epoxy would work well. Or get the SPI flat/matte black and experiment with the ratios like Crash mentioned. If you were my customer and asked for that, I would use epoxy. If you said it's too glossy only then would I use the SPI matte black.
 
I'm not sure why the gloss of the red oxide matters when it's going to get sprayed over by black, but don't get too excited about the gloss just yet. As mentioned, it does become more of a satin over time as the epoxy cures and it loses gloss. About 10% reducer does flatten it a bit, plus it makes it spray a lot smoother.
 
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