Painting - what are we doing wrong?
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  1. #1
    Rods 'n' Sods Junkie mundungus's Avatar
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    Painting - what are we doing wrong?

    Just got home from where we keep our truck, having spent the evening putting acid etch primer on some of our suspension parts (axles, shackles etc), and bonnet.

    Whilst spraying, I noticed that the gun is kinda going '... puh, puh, puh ...' as though there isn't enough paint getting through. Even though the gun is over half full.

    There is plenty of air, and for the most part we're holding the gun upright as per normal, so I can't see a reason that it would be having trouble getting the paint through. Its the same gun and air pressure that we used last time, and I don't remember having the same trouble then.

    Any ideas?

    Have we just mixed up the paint too thick? or done something else wrong?


    For the record, my girlfriend (littletruck) and I are novices at this. Only had our truck just under a year, and the sum of our experience at spraying, is that we sprayed the chassis a few months back.

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  3. #2
    Official RnS Addict stevie.t's Avatar
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    how do you clean the gun after use? you also need to measure your paint etch primer is about 50/50

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    Rods 'n' Sods Junkie mundungus's Avatar
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    Tons and tons of thinners. I give it a good clean so that there's no paint left in it, then spray a load of clean thinners through it, and leave it about half full of clean thinners, with the screw on nozzle parts inside, in the thinners.


    I would say we was about 60/40 on the thick side. I'm pretty sure that's how we did it last time.

    We did mix up a 50/50 solution, but it seemed well too thin (in our amateur opinions), so I put a smidgeon more of the thick stuff in, mixed it up, and poured it through a cone shaped filter into the cylinder thing.

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    Rods 'n' Sods Junkie 59Chevy's Avatar
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    Have you actually stripped the gun down and cleaned it or just blown thinners through it ? ... secondly make sure the pot breather isn't blocked. Could be all sorts of reasons, sticky needle anything .....
    Ring the F**king nuts out of it !!!

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    Off the Xmas card list kapri's Avatar
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    Secon dteh pot breather idea. Plus 50/50 ? What paint are you sparying ?

  8. #6
    Rods 'n' Sods Junkie mundungus's Avatar
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    Just sprayed thinners through it. TBH I didn't realise there was much that can be taken off of it.

    I'll have a look at dismantling it this weekend then. And work out which bit is the breather.


    Paint is upoxy acid etch primer. It comes as a tin of thick brown paint and a separate (same size) container of activator. The guy in the paint shop said 50/50 as well.

  9. #7
    Mopars and Gassers Ivor's Avatar
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    The Upoxy etch primer should be quite thin mixed, ideally, you ought to buy yourself a viscosity cup (it's a Din spec cup with a hole in the bottom) and measure the viscosity.

    It also sounds like you have a suction cup gun (paint pot at the bottom) and they can struggle a bit with high viscosity materials compared to a gravity cup (cup on the top).

    Also I agree with the other guys, it's important to clean the gun thoroughly especially the breather hole, which should be in the top of the paint pot lid and make sure if it has an anti drip gasket inside, that's clear as well.

    I'm assuming you've got plenty of air coming through your compressor, you probably need about 30 psi at the gun and the air volume to keep pushing the paint through.

    HTH!

  10. #8
    Rods 'n' Sods Junkie mundungus's Avatar
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    I guess the paint shop should do them cups right?



    The gun is this one from machine mart.


    http://www.machinemart.co.uk/shop/pr...nt-air-brushes

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    Official RnS Addict bigjob's Avatar
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    This Put put put ,sounds like the gun is drawing air ,check the main kneedle jet retaining nut is tight,Bry
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  12. #10
    Compulsive chicken choker English Impala's Avatar
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    I used to have the same problem, my solution now is to buy a £40 gun from Machine Mart & treat them as disposable, buying a new one every 3 or 4 years. No matter how well I think I've cleaned them after use, it just seems to do the same as yours after standing idle for a few months.

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