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FDP Forum / Guitar Mods, Repairs, and Projects / Spraying water-based poly advice

Mick Reid
Contributing Member
*****

Australia

American-made in Oz!!
May 27th, 2019 12:39 AM   Edit   Profile  

Anyone applied water-based poly with a HVLP gravity gun?

I'm curious about nozzle size, thinning ratio and air pressure.
The product I'm interested in is Intergrain Ultraclear Interior Gloss (Dulux) so any first hand experience would be great. (probably not available in the US)

I had an online chat with someone from Dulux, but they weren't that helpful when it came to spray application.

What I *have* been able to glean from the interwebs, is: 10-20% thinning and a medium size nozzle (1.5mm+/-).

Any affirmation or argument for these numbers? From my very limited experience, they make sense, and I'd guess 25-30 PSI inlet pressure.

Thanks for any input/advice.


Peegoo
Contributing Member
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Planet Peegoo

Rhythm & Lewd Guitarist
May 27th, 2019 08:57 AM   Edit   Profile  

I've never sprayed water-based poly.

My only advice though is don't rely on percentage of thinner to add in order to get the gun flow rate correct for a finish. It's much more reliable to use a viscometer/viscosimeter/viscosity cup (they are cheep). Common ones in paint stores are plastic, but you can also find inexpensive V-cups of stainless steel that are inexpensive, impervious to all solvents, and last forever.

This

wrnchbndr
Contributing Member
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New Jersey

I'm back with the otters again
May 27th, 2019 01:08 PM   Edit   Profile  

Having never taken this advice myself...

Practice and experiment on scrap.

Mick Reid
Contributing Member
*****

Australia

American-made in Oz!!
May 27th, 2019 04:59 PM   Edit   Profile  

"I've never sprayed water-based poly."

How about solvent based?

And would a 1.5mm+/- nozzle be appropriate?

My gun came with 1.4/1.7/2.0mm nozzles.
I've used the 1.4 for both base coat and clear coat (lacquer) so am presuming the same for poly would be ok.

re: Practice and experiment

Yes, I plan to do some methodical testing with a half sheet of plywood masked off into squares and then play with pressure, fluid flow etc.

However this little experiment will cost me about 200 bucks for materials half a days time, so I need to do it when I'm bit more flush.

I know the experience will be invaluable, but in the end, I'll still only finish up with an expensive, shiny piece of plywood :^)


Te 52

Laws of Physics

strictly enforced
May 27th, 2019 06:11 PM   Edit   Profile  

"I'll still only finish up with an expensive, shiny piece of plywood."

Just put a frame around it, give it a jazzy but obscure title like "Ectoplasmoid No. 11 (Left Transit), M. Reid, 2019, polyurethane on plywood, 244cm x 122cm," and place it in a high-end art gallery with an audacious price tag. I can see the reviews now: "Reid's fascinating exploration of subtlety and nuance in texture and sheen in this monochrome work brings the viewer face to face with their own preconceived hierarchy of cultural values and assumptions of artistic worth."

(This message was last edited by Te 52 at 08:15 PM, May 27th, 2019)

Mick Reid
Contributing Member
*****

Australia

American-made in Oz!!
May 27th, 2019 10:32 PM   Edit   Profile  

HAH!!! That's brilliant Te 52!

Cheers


FDP Forum / Guitar Mods, Repairs, and Projects / Spraying water-based poly advice




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