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  1. #1
    Join Date
    Apr 2005
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    Default Spraygun blocking - WB lacquer

    Started using Mirotone 8022 / 8060 precat waterbase sealer / topcoat combo early this year.
    I found it quite excellent in most respects - sprays well, drys really nice and sands like a dream within hours. Holds its matt surface very well with wear. It is a great improvement in most respects on the stinky Mirotone high VOC 3022 I've been using for years.

    However I am having problems with the guns blocking during a short 3 -4 minute spray job. Starts out spraying real nice and after a minute or two the flow will begin to slow. After a flush with water it will come back pretty quick. Surely I dont have to clear the gun every few minutes to keep the flow going?

    The guns are gravity fed. The sealer gun is the standard size Star S770 with a 2mm tip the other [for topcoat] is a Star mini with a 1mm tip. The finish I'm using today was thinned and put in a jar about a months ago. The consistency that works for me is about about the same as unwipped cream. It comes off the small gun nice and smooth with lowish fluid and airflow. The sealer seems to gum up worse and you need to blast that through a bit harder.

    Having used WB finishes in the early noughties I realise they are more high maintenance. Ive tried the usual suspects like the air bleed hole in the container, changing filters then a new filter and finally no filter. The gun was pulled down and fully cleaned last nite.

    Any advice?
    ray c
    dunno what's more fun, buyin' the tools or usin' em'

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  3. #2
    Join Date
    Aug 2018
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    Portland Vic
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    Default

    You could try filtering the finish as you put it into the gun

  4. #3
    Join Date
    Jan 2014
    Location
    Kingston, Ontario, Canada
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    3

    Default

    If you're still having blocking problems with your sealer gun, it most certainly isn't due to the tip size, which is actually very large for most lacquers. I prefer a 1.3mm needle/nozzle size for lacquers.

    I suspect, just as has already been suggested, that it's due to tip blockage due to unstrained finish making its was into the fluid path. You should ALWAYS strain finish as you pour it into your gun (or pressure pot). For the lacquer you cite, a medium size mesh strainer would be ideal.

  5. #4
    Join Date
    Jun 2015
    Location
    Sydney
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    70

    Default

    There will more solids in the satin/matt finish, so putting it through a strainer is the way to go.

  6. #5
    Join Date
    Apr 2005
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    Melbourne Outer East right next to mount dande
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    Default

    thanks for the advice
    it was the finish causing the issue
    it had gone kinda stringy after sitting
    after putting it through a 100 mesh screen it was all good from there
    ray c
    dunno what's more fun, buyin' the tools or usin' em'

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