LumberJocks

All Replies on Do I need to thin water based polyurethane when spraying ?

  • Advertise with us
View Carloz's profile

Do I need to thin water based polyurethane when spraying ?

by Carloz
posted 10-24-2016 04:19 PM


4 replies so far

View Fred Hargis's profile

Fred Hargis

5033 posts in 2575 days


#1 posted 10-24-2016 04:57 PM

I’ve sprayed it with my Fuji 4 stage and a 1.8mm needle set though I think I did thin it 10% with water. Be careful to not add more water than the manufacturer says, it can screw up the coalescing process.

-- Our village hasn't lost it's idiot, he was elected to congress.

View Carloz's profile

Carloz

1147 posts in 673 days


#2 posted 10-24-2016 05:16 PM

Just found it: The guy from General Finishes. sprays it with a much less powerful Earlex 5500 without thinning.

View AlaskaGuy's profile

AlaskaGuy

4269 posts in 2391 days


#3 posted 10-24-2016 05:42 PM

It would really be nice if finish manufacture woulds would put the viscosity time on the label.

Example: 25 seconds in a #4 ford cup. It would make it so much easier to pick a spray tip size and pressure.

http://homesteadfinishingproducts.com/wp-content/uploads/2014/05/paintspraying_ver3.pdf

-- Alaskan's for Global warming!

View rwyoung's profile

rwyoung

409 posts in 3554 days


#4 posted 10-24-2016 07:22 PM

Viscosity is given on the technical data sheet (but not the label).

https://generalfinishes.com/sites/default/files/file_downloads/tech-data-ef-high-performance-poly-2014-07-28.pdf

Given as 35-45 seconds with a Ford #4 at 77F. Quick survey of Fuji manual suggests they want 15-18 seconds for polyurethenes and the 2mm N/N set. However this could be the wrong manual.

All such numbers extracted from manuals and data sheets are merely starting points for setting up the system(s). Test prior to spraying a project. Big sheet of cardboard makes a good target, reasonably simulates spraying a wooden surface.

-- Don't sweat the petty things and don't pet the sweaty things.

Have your say...

You must be signed in to reply.

DISCLAIMER: Any posts on LJ are posted by individuals acting in their own right and do not necessarily reflect the views of LJ. LJ will not be held liable for the actions of any user.

Latest Projects | Latest Blog Entries | Latest Forum Topics

HomeRefurbers.com