I have one of Eastwood’s entry level guns, concourse pro. It comes with a 1.3, 1.7 and a 2.0 tip. It looks like SPI recommends a 1.4 -1.5 tip for their product. Naturally, I don’t have that size tip and it does not look like Eastwood has that size for this gun. anyone have any thoughts on whether I go smaller at 1.3 or whether the 1.7 would be the better call for the primer?
Tip size for SPI Epoxy
Dragsix
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I have one of Eastwood’s entry level guns, concourse pro. It comes with a 1.3, 1.7 and a 2.0 tip. It looks like SPI recommends a 1.4 -1.5 tip for their product. Naturally, I don’t have that size tip and it does not look like Eastwood has that size for this gun. anyone have any thoughts on whether I go smaller at 1.3 or whether the 1.7 would be the better call for the primer?
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I'd try the 1.3. If that acts funny, the 1.7 would probably work but you'd need to spray faster. I spray my epoxy with Harbor Freight guns that have a 1.3 tip if I remember correctly and it's done fine.
I've never sprayed SPI, but as a general rule when you increase the tip size you apply slightly more primer/paint all else equal. You also will have a coarser texture to the finish, but if you want build up that's the way to go. On the contrary, decreasing the tip size will give you a flatter finish with less primer/paint applied. Often if you decrease tip size you'll need to add some reducer to get it to spray best. For instance when you spray it as sealer and don't intend to sand it, you'd reduce it per the mfr's suggestion and use a smaller tip.
If this is the first coat of primer, use the larger tip and see how it goes. I wouldn't freak out too much here, your range of tips to choose from is good, you just need to see what they do with the SPI.
If this is the first coat of primer, use the larger tip and see how it goes. I wouldn't freak out too much here, your range of tips to choose from is good, you just need to see what they do with the SPI.
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SPI have a TDS sheet you can d/l?
Should be on there.
I know PPG sheets do.
Should be on there.
I know PPG sheets do.
use the 1.7 it will be fine.
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I would go 1.7 as well. You may try thinning slightly less and try spraying out on some cardboard to see how it flows and adjust accordingly.
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So I mis read the tip and thought I was installing a 1.7 tip. Instead I installed the 1.3 tip. I mixed the SPI one to one with the activator, and added a little reducer. So here I am spraying thinking its the 1.7, its spraying nicely, flowing out pretty well, no runs, nice sheen to the primer. got two coats on. Finished up and the under side of the floor and trunk floor look pretty nice in red oxide. Then I discovered I shot the whole thing with a 1.3 tip. So with the EDP and two coats of SPI epoxy primer I think I have enough on the metal to protect it for a good while. The stuff on the underside of my 57 has been on there since 2013 and is holding up terrific. It turned out pretty good for backyard hacker work in a dusty garage shop. Good thing its under the car, lol. I will post a photo.
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Sometime things accidentally turn out for the best. I am glad it worked out for you.
30 psi may be a bit low, but guns usually have their own pressure they work best at, hard to say without having a Eastwood gun to tell you. I spray my epoxy and urethane primers out of an ANI F160 at 40 PSI and a 1.3mm tip. I have used my DeVilbiss Starting Line guns for that too and they work best at about 35 psi with a 1.3mm tip.
Sometimes its better to be lucky than good. Only times things work out well for me is when I'm lucky. HA!
What he said ^. Most HVLP guns have a recommended pressure at the inlet which produces the required 10 psi at the tip. I have an old Devilbiss gun that takes 23 psi at the inlet. It's the one I usually shoot epoxy with. All my other guns need 50 psi at the inlet. So find out, that info should be available for your Eastwood gun either in the paperwork that came with it or on their website.
They will give you a recommendation for inlet psi, but be prepared to adjust it slightly after. I’ve even seen two “identical” guns run better at two different pressures (4-5 psi difference). I have no explanation for it.
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I have found that mixing my paints and primers with a viscosity cup per gun manufacturers specs alway sprays out better than mixing to the paint manufacturer specs. When mixing to the paint manufacturer specs, they are assuming all guns are equal. We all know this is not the case. I figure the gun manufactures know their guns the best and spraying at the viscosity rated for their tip used will usually give you the best results.
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I have been able to get it from the gun manufacturers. Having said that, I haven’t sprayed with a compressor in years. Once I tried a turbine sprayer, I would never go back to a compressor. I have two Apollo guns and an AccuSpray gun. Both manufacturers were able to provide me with their viscosity recommendations for each tip size that I use. I used both Devilbiss and Binks when I sprayed with a compressor. You should be able to get this info from them if you call their customer support.
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I should have mentioned that the most common viscosity cup is a #2 Zahn’s. Viscosity is rated in Zahn’s seconds. This is the info you would be looking for when calling a manufacturers tech support. For example, on my Apollo 7500 gun that I use for base coat, Apollo recommends the Zahn’s viscosity of 17-20 seconds with a 1.3 tip. I use a 1.8 tip for primer with a viscosity rate of 20-22 seconds. Sprays out great every time using this method.
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The paint won't flow on cardboard the same way it will flow on metal, because the cardboard will absorb some of the paint. The best surface to test spray is on a sheet of metal or plastic.
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