PVA Cleanup

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#1

So the first (and last) time I tried to spray PVA with my cup gun, I tried to clean it up with acetone. BIG MISTAKE!!! :eek: It completely gummed up. So what do you clean PVA with? Is it water soluble? :confused: Do I need to worry about the water rusting up the gun? If I can’t spray with my gun, are there other ways to apply PVA?

Sorry if this is a repeat question. I tried searching the archives for an answer, but the search engine says that ‘PVA’ is too short of a search term and excludes it. :frowning:

Cheers,

Jeremy

#2

I just clean up PVA with water.

#3

water… nothing more

i JUST got a .8mm tip? maybe .9? or 1.mm. not sure ill check again, touch up HVLP gun. SMALL very nifty… 56$'s from harbor and it worked GREAT!!! i sprayed 4 layers of it quickly and it came out smooth! dried up in seconds.

#4

Just get a Harbor Freight $20 plastic cup gravity feed special and make it a PVA gun 1 out of 3 will have a fluid needle leak but for $19.95… If you start shooting spider webs add a tbs. or 2 of water until it dont. The water will add to the dry time and make it run easy when the mold is cold (below 70 deg. F.).

#5

…and after cleaning it out with water, add paint thinner as the oils in it will prevent rusting up too!

#6

Why bother to use PVA in the first place? Wax is far easier, and doesnt mark the finished product like PVA. I tried using PVA just once and will never bother again.

#7

what brand of wax do you use?

#8

Semi Pernament for me here with Meguirs gold mold releas.!

But Meguirs was working on a new mold release system and was going to use a classroom for prepping their sales people…:rolleyes:

#9

Hey Werksberg, what waxes are ‘semi-permanent?’ I have a Tin of Meguiar’s #8. Is it not semi-permanent? Is Carnauba wax semi-permanent? Brand-names and sources would be appreciated. Thanks!

Jeremy

#10

PVA is nice because you dont need to worry about your surface wax prep. depends on the part but i feel like i could spray pva on sand and pull parts from it.

#11

After you have a good coating of wax on your mould, there is no need to rewax every time. T

To some extent all good quality release waxes are semi permanent, and you only need to apply further wax after laminating a number of mouldings.

On the other hand you need to apply PVA every time, and this in combination with the poor surface finish you get with PVA, really makes me wonder why anyone would use it rather than a good wax?

#12

Sorry for reviving an old thread here…

So using PVA isn’t a good idea? How does the PVA affect the part?

Another noob question from me.