We are doing a one-off project for a museum expansion. The spec is to use a waterborne, so we're going with Zenith sealer and a pigmented c/v.

I don't use any waterborne as a rule, so this is new for me. My decision, no need to preach, thank you. The shop has a 2 gallon pressure pot with a binks gun which is currently set-up for priming with Valtec primer. I'm going to flip that over for the duration of the wb project, starting with new fluid hoses. Project will take approx. 26 gallons total between primer and colorcoats

My question is how to flush the lines? Water? Water followed by acetone?

Thanks

we run a lot of waterbased, and use a kremlin - what i do is use warm water to flush the lines, and then for any duration beyond ... 12 hours or so, i flush and load the sprayer with Acrastrip. it's a water-based surfactant, and really attacks the finish. so far it's worked quite well. and, the acrastrip can be used over and over again, we have a 5 gallon pail 50/50 with the cleaner and water, and simply flush that through after spraying and recovering the finish.

good luck!

Thanks for the info. I just googled it, do you use the 600 or 800 series? There is an online store, do you use that? My supplier does not stock it. I am in southern New Jersey, thanks.

I agree with the polychem acrastrip B/G 600 automotive flush.... we do the same. we also flush with acetone on our solvent systems and pump in polychem for any systems that will be idle for more than a few days...Keeps the internals super clean and keeps from things building up plaque in the lines...

TO SHANE !
Question on your " we also flush with acetone on our solvent systems and pump in polychem "
Not quite sure to follow your steps ?!
Got the cleaning with acetone.....but, got more on this "polychem" ?
What is this prod ?!
Thks,

diluted simple green will chew up waterborne finishes. Alcohol likewise is aggressive. Good for getting rid of the water.

sorry I wasn't clear so i'll address it better
Here is our flush procedure for waterborne finishes with AAA type pumps/lines
1. Pump out coating back into container or waste container
2. Pump in compatible cleaning solvent (water for waterbornes & Acetone for solvent bornes...... cycle lines and pumps till pump/lines run clear
3. Pump out this clean solvent or water into waste container.
4. Pump in polychem into the system and flush/recirculate through system to make sure it cleans out all the material the first flush didn't get.
5. shut down for the day/week/month however you see it.
now next time you fire the lines up they will be clean and ready for production..
1. pump out polychem into it's container
2. Pump in clean compatible solvent
3. pump out solvent
4. Pump in coating for production...
seems excessive but if you run this way out of habit your equipment will always be clean and ready for any situation.... even going from pigment to clear... it's always clean... granted we have over 30 AAA pumps in use at any given time and have pumps dedicated to clear and pumps designated to pigment..... some folks don't have this option and this procedure is totally acceptable to flop back n forth

Shane !!

Please, can you give a link for this POLYCHEM ?
Thanks

Shane, curiousity has the best of me; what type of woodworking do you do that you would be running "30 AAA pumps at any given time"?

On a related subject, since its the season. Do you get the best ever Christmas presents from your finish machinery salesman???

Robert.... we currently get our supply or polychem from our local Airpower sales rep... they have locations up the east coast and ship the product to us.. it's pricey but well worth it.. will last a very long time if you keep it clean..

Tip top: I manage a large custom architectural finish department here in the southeast.... We have 10 open face manual spray booths... two automatic linear spray lines for trim and a flat line setup with a UV roll coater with Finish sanding capable widebelt sander... We have pumps all over the place..