Author Topic: Failed HVLP attempt, Advice?  (Read 1201 times)

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Offline 3PedalMINI

  • Posts: 490
    • Signature Sound & Video
Failed HVLP attempt, Advice?
« on: March 24, 2019, 09:26 PM »
Im spraying a cabinet using my Fuji MM4 and T75g gun. Using Emtech HSF5000 Primer. Tried with 1.3 and 1.8 and had a horrible time. It was confirmed a few times from the supplier and reading online that I did not need to thin the primer. I got a very blotchy spray (spitting isnt the right word, but kind of similar) I could not get it to lay nicely. Now the cabinet is "bumpy" Not a HUGE deal because obviously I have to sand anyway but the finish overall is terrible. My garage was 67 degrees and 50% humidity. Im thinking this did infact need to be thinned?

to say im a noob at spraying HVLP is an understatement. Im now really nervous about shooting the Emtech 6500 with HVLP. Thinking to finish this cabinet I should shoot it with my airless sprayer and practice getting the gun/paint viscocity correct on some scraps after its out of the shop.

I stupidly went forward with spraying hoping things would get better. Not a huge deal since it was primer, but now I have more sanding todo.
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Offline Mike Goetzke

  • Posts: 225
Re: Failed HVLP attempt, Advice?
« Reply #1 on: March 24, 2019, 09:50 PM »
I’m not an expert either but I’ve always needed to thin Target coatings finishes with my Q4. I’ve also had better luck with more airflow and smaller tip. I suggest practicing on a scrap board.

Mike

Offline 3PedalMINI

  • Posts: 490
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Re: Failed HVLP attempt, Advice?
« Reply #2 on: March 24, 2019, 10:07 PM »
I’m not an expert either but I’ve always needed to thin Target coatings finishes with my Q4. I’ve also had better luck with more airflow and smaller tip. I suggest practicing on a scrap board.

Mike

Interesting. I guess I should have not taken the paint stores word and what I found online about thinning. Would you say what I experienced was due to not thinning? I’m trying to find a picture that best shows it. Maybe when I try again I’ll take a picture.

I did have some scrap plywood pieces to try first. I should have just quit and asked on here. It’s a project that is long overdue and im excited to finally be done with it.
The Bitterness of poor quality remains long after the sweetness of low price is forgotten -Benjamin Franklin

Professional Custom Audio Video System Designer/Installer serving Southern - Middle NJ, Eastern PA & the Surrounding Shore Points.
www.sigsv.com

Kapex 120,TS55,RO150,ETS125,CT-26,CT-MIDI,Tradesmen Cleaning Kit, Festool Ratchet Kit, Sys-lite, Sys Roll Cart, T18 +3, 2013 Centrotec Kit, Carvex 420, Carvex Accessory Kit, CXS,RO90, TI15 and Various Festool Systainers

Offline tjbnwi

  • Posts: 5947
  • Cedar Tucky Indiana
Re: Failed HVLP attempt, Advice?
« Reply #3 on: March 24, 2019, 11:07 PM »
Put the gallon can in a pot of 100° water. Allow gallon to warm. Fill the cup, place the can back in the water, spray, repeat.

Tom

Offline Pnw painter

  • Posts: 203
Re: Failed HVLP attempt, Advice?
« Reply #4 on: March 25, 2019, 01:14 AM »
I’ve found that things only tend to get worse and not better when I’m spraying.

Tom’s advice about worming up the paint might make a huge difference. The viscosity of some paints at can really be effected by cold temps.

On a recent project I’d leave a gallon of paint sitting on a heating pad over night to ensure it was ready to spray the following morning.


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Offline blaszcsj

  • Posts: 431
  • I like building stuff with my hands.
Re: Failed HVLP attempt, Advice?
« Reply #5 on: March 25, 2019, 12:04 PM »
Check it with the viscosity cup that came with the gun and review the times against what it says in the manual. For doing thicker paints, the book also recommends removing the black ball valve for the incoming air at the bottom of the gun. It allows for no restriction and highest flow.

hope this helps. The manual recommendations actually work pretty good.
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Offline mschmidt10k

  • Posts: 12
Re: Failed HVLP attempt, Advice?
« Reply #6 on: April 23, 2019, 10:26 AM »
With a Fuji MM4, there's no need to thin the Emtech HSF5000 at all - I spray it with a 1.3 cap and it lays down easily. Did you try it out on a practice board beforehand so you could set the spray pattern/air flow?