SATA tip size, primer and PPS

K

keith_y

After reading Northern Daves test about tip size differences from manufactures combined with my own trial and error of spraying 6520 and 8000 in summer heat, I would like to share this comparison and get feedback. These tips are KLC HVLP 1.7, Jet 100 RP 1.8 and 5000 HVLP 1.4. Notice the 1.7 is by far the largest. The 1.8 and 1.4 are identical to my eye. The 5000 has the diffuser which slows airflow down I assume.

I also have a Jet 100 2.5 poly gun that I tried spraying 6520 and 8000 mixed 4:1 out of because the 1.8 was struggling even with reduced primer. The 2.5 was too difficult to control. Each coat sprayed differently. Then I decided to try the 1.7 since it's actual nozzle opening was between the 1.8 and 2.5. It seems to spray the best for 6520 and 8000 mixed 4:1:1 part retarder. Ive found I have to use that much retarder to keep the primer from gelling in the 95+ heat that I have to spray in. Note, I only mix enough for one coat of whatever Im spraying. Im getting very minimal, if any dry spray and more mils for whatever reason even over the 2.5.

We also use PPS and Im 99% sure those are causing most of the issues. They just dont seem to flow like a cup or RPS. Any thoughts?
 
I've sprayed all 3 SPI 2K primers through my jet 100 RP 1.8 without any issues, but I don't have to deal with such high temperature here in BC Canada.

Have used the regular aluminum cup for bigger jobs and the PPS for smaller stuff without any big issues.

On the HB primer and big panels on an Econoline van I did add a smidge of retarder plus 0885 reducer to avoid dry overspray.
 
With PPS or similar liner system I usually flip the gun upside down, unhook the air and squeeze the trigger to bleed air back into the cup when I see the liner is about 75% collapsed. I notice a drastic decrease in fluid flow once that liner gets 75% or further collapsed, so I try to make sure my upside down spraying is done with by then and I just let a bunch of air back into the liner and I'm able to finish out what's in the cup at a full spray rate.

I know that has nothing to do with your tip comparison, just an additional comment I thought I'd toss out there. I also believe the DeKups liners are a tiny bit better in this respect, I think the liner material is maybe a bit thinner or maybe just more flexible, they seem to collapse with less restriction on paint flow than PPS.
 
northerndave;n85030 said:
With PPS or similar liner system I usually flip the gun upside down, unhook the air and squeeze the trigger to bleed air back into the cup when I see the liner is about 75% collapsed. I notice a drastic decrease in fluid flow once that liner gets 75% or further collapsed, so I try to make sure my upside down spraying is done with by then and I just let a bunch of air back into the liner and I'm able to finish out what's in the cup at a full spray rate.

I know that has nothing to do with your tip comparison, just an additional comment I thought I'd toss out there. I also believe the DeKups liners are a tiny bit better in this respect, I think the liner material is maybe a bit thinner or maybe just more flexible, they seem to collapse with less restriction on paint flow than PPS.
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I recently started using the SATA RPS cups instead of the 3M and they work better as they have no liner and they flow freely till the last drop of clear.

I also hate that when the 3M stuff is all collapsed it can force some crap through the filter and it sure as hell will land on your panel as big lumps of trash.

I have yet to spray primer with my SATA and the RPS system but I guess it will be even better than the clearcoat spraying since primer is thicker.
 
Jorge M.;n85031 said:
I recently started using the SATA RPS cups instead of the 3M and they work better as they have no liner and they flow freely till the last drop of clear.

I also hate that when the 3M stuff is all collapsed it can force some crap through the filter and it sure as hell will land on your panel as big lumps of trash.

I have yet to spray primer with my SATA and the RPS system but I guess it will be even better than the clearcoat spraying since primer is thicker.
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The SATA RPS cups fit the Accuspray without an adapter?
 
Outlaw;n85036 said:
The SATA RPS cups fit the Accuspray without an adapter?
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Oh no, those two don't work together. Sorry if I confused you, I was talking about spraying primer with a SATA gun not the 3M accuspray.
 
We've just started using SPI and I know ill have to adjust in cooler weather. Summer heat is just not ideal spraying conditions.
 
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