Paint viscosity question

Robg · Posted: Mon Apr 02, 2012 6:06 pm Post subject: Paint viscosity question

Just got through spraying the first coat of Gillespie primer Red Oxide III. Started with the Rapco thinning recommendation of 4 to 1 paint to thinner and used Xylene. First sprays were running quite a bit using an regular spray gun at 45 psi. tip pressure. I refferred to my HVLP viscosity guide on primers and it reccommended a 30 second viscosity drip which was considerably thicker than the 4:1 thinning. The spray went on with excellent results and no runs or orange peel using the viscosity recommendation for the HVLP sprayer. I remember seeing another post where someone sprayed right out of the can without thinning but I don't remember where I saw it. My questions are: has anyone else experienced this and, more importantly, is this going to be true with the finish coat of AJP late WW II OD?

Bretto · Member Joined: Nov 24, 2010 Posts: 1390 Location: Orem, UT

Ive been shooting all my Rapco paint and primer approx 4:1 (depending on the temp) with a 1.5mm tip no problems. This is with Xylene also. I had maybe 5 minor runs this whole time but that was because I was either spraying to close or to long at one spot. Multiple thin coats are key.
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Brett
'51 M38
PHOTO DIARY OF MY BUILD

sonny · Posted: Mon Apr 02, 2012 7:21 pm Post subject:

When I spray the Gillespie AJP late paint, I use 2:1 with synthetic enamel reducer and 8:1 synthetic enamel hardner with HVLP gun set at gun's recommended pressure. Have painted two M38s and two M100s with great results. Dry in 1 hour and stenciling in 48 hours - Sonny
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1951 M38, 1952 M38, 1952 M100,1946 Bantam T3-C, RT-66/GRC, PP-112/GR, MT-299, DT-44 Mine Detector, MVPA # 33068, PMVPA CO

Bretto · Member Joined: Nov 24, 2010 Posts: 1390 Location: Orem, UT

Sonny,
Does the paint flow really good that thin? I may have to give that a try in going a little thinner for my 1st coats.
_________________
Brett
'51 M38
PHOTO DIARY OF MY BUILD

Robg · Posted: Mon Apr 02, 2012 7:30 pm Post subject:

Sonny,
Can you give me a product part number for the sythetic enamel reducer? The guys at NAPA don't seem to have that on their computers.
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1955 M38A1

Bretto · Member Joined: Nov 24, 2010 Posts: 1390 Location: Orem, UT

Xylene is a synthetic enamel reducer
_________________
Brett
'51 M38
PHOTO DIARY OF MY BUILD

DJ · Member Joined: Apr 15, 2005 Posts: 289 Location: Wis.

Dupont 3812s or OMNI MR186. The Dupont was fast drying, The Omni was medium. The Omni came from my Napa store ,Dupont from Car Quest.

Napa no longer sells Dupont,find a store that does and you are good to go. My Napa guy found me some in a different brand,I can get it tommorrow for you ,if you want.

Robg · Posted: Tue Apr 03, 2012 8:36 am Post subject:

Thanks DJ. I may take you up on it if I can't find it locally.
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1955 M38A1

sonny · Posted: Tue Apr 03, 2012 8:05 pm Post subject:

The synthetic reducer I referred to is NAPA's Synthol 8004. My local NAPA dealer orders it from their paint store. In this ratio, it sprays great with HVLP - no orange peel and I've never had a run - Sonny
_________________
1951 M38, 1952 M38, 1952 M100,1946 Bantam T3-C, RT-66/GRC, PP-112/GR, MT-299, DT-44 Mine Detector, MVPA # 33068, PMVPA CO

DJ · Member Joined: Apr 15, 2005 Posts: 289 Location: Wis.

What I got from NAPA was Martin Senour Paints PCR10 reducer.


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