Spraying/Sanding Ranthane

Discussion in 'Fabric & Paint' started by bigblackmastiff, Apr 28, 2018.

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  1. Jul 3, 2018 #21

    Don Adamson

    Don Adamson

    Don Adamson

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    Dan, Are you mixing fresh paint for each coat? I found when painting in the heat or using accelerator it lays down smoother when fresh and not starting to cook off.
     
  2. Jul 3, 2018 #22

    wacoc8

    wacoc8

    wacoc8

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    I used a regulator at the base of the gun and made sure 40 psi at the gun. 1.3mm tip. I believe that Ranthane recommends 18 seconds on a #2 Zahns cup, which is about 33% thinned. That is a minimum. Open up the fan pattern and the amount sprayed fully. Practice. I used a lot of sandpaper to fix my learning curve.

    Have fun!

    Dave
     
  3. Jul 3, 2018 #23

    bigblackmastiff

    bigblackmastiff

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    Don.
    Thanks, I had about a half a cup in the gun after the mist coat. I mixed more, let it sit for 25 mins along with the mist coat, then reduced. I added this to the gun cup and sprayed the flood coat. I'll plan to keep a fresh mix as you suggest.

    Dave,
    I'll check for 40 at the gun.

    I've been busy wet sanding and getting other sheet metal as clean as i can for primer. With my work schedule it will be a week or so before I get the chance to try more color.

    Dan
     
  4. Jul 11, 2018 at 4:06 AM #24

    bigblackmastiff

    bigblackmastiff

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    Well Eric, You were on the right track on the connectors. The quick connect's valve at the gun was fouling/jambing and starving the gun. I had PSI but no volume. Also my regulator had given up. I tried a cheap regulator from HF while I was hunting for my issue and it lasted about an hour. I've got another in place now.

    You asked about the Gun, Its a SATAjet 3000 HVLP. It has worked perfectly up to this point.

    I've got some wet sanding to do and then I'll see if I've resolved my issues.
     
  5. Jul 11, 2018 at 4:52 AM #25

    taff

    taff

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    Your gun is probably the sweetest gun ever produced.

    The quick connector will make a huge difference to how the spray gun performs.
    Attaching a photo to show 3 sizes, on the left is your normal HDepot variety (OK for air tools) the others allow higher air volume through.
    If you made an evaluation with one gun and one air gauge, say to show 30psi with the trigger pulled fully
    (it's not important what the gauge reads with static air) with the very narrow connector, you will be starving your spray gun with volume.
    Change over to the large connector and you will need to adjust the gauge until it shows 30 psi, you will also be allowing more air volume through the spray gun.
    Especially important with HVLP spray equipment because they require more (higher) volume of air.

    DSCN8201.JPG DSCN8203.JPG
     
  6. Jul 11, 2018 at 5:30 AM #26

    bigblackmastiff

    bigblackmastiff

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    Copy Eric

    I think it was your advice a couple of years ago that led me to the SATA.

    I bought hi-flow connectors but they aren't as open as shown. I'll look around. It was actually the hose side of the connection that failed me. I was in the habit of having everything connected including the gun before turning the air valve on from the regulator. I hadn't noticed that the valve in the hose end was catching and sitting diagonally across the mouth of the hose, I believe starving the gun.

    Anyway, Hoping that was the worst of it.
     
  7. Jul 11, 2018 at 1:07 PM #27

    taff

    taff

    taff

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    Probably the best place it get high flow quick connector coupler sets would be from Automotive Jobbers. I have never seen them at hardware stores.

    I forget to mention this or maybe you already know.
    Example:
    *Regulator on the wall
    *Hose hard wired to regulator (no quick disconnect. If there is one make sure it is a high flow).
    * Say 50 to 75 feet of air line. (The longer the line the bigger the pressure drop)
    *High flow quick disconnect coupling at spray gun side
    * Mini air regulator with gauge at gun handle (you need this to know what air pressure you will be using)

    This mini air regulator.
    Don't use it to regulate the air going in to the spray gun, use it only as an air pressure gauge. (you can buy non adjustable air gauges only)
    Some call this a "cheater valve"
    Lets say you have 100 psi at the wall and you cheat the air pressure at the gun to 30psi.
    You are also reducing the the volume of air that can pass through because of the restriction you made inside the valve.
    You want this mini regulator to be as high volume as possible.
    So open up the regulator to maximum setting and then go to the wall and reduce the air pressure there until you get the 30psi at the spray gun gauge.
    The wall regulator is capable of pressure reduction without air volume reduction. (rated at a much higher cubic feet per minute [cfm])
    Your HVLP spray gun or any spray gun's performance will improve.
     

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