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1962CKD
 Post subject: Spray on
PostPosted: Thu May 12, 2011 7:29 am 
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Location: Melbourne
Powder coating can be applied in 3 ways,

Electrically polarise each item and they electrically attach before mechanically locking when the powder is melted on the part in an oven.

Fluidised bed where the part is preheated and submersed in a mist of powder (normally a bath) The powder melts on contact with the hot part

Premelt Powder where the powder is melted as it leaves the gun and cools when it hits the object.

At home the easiest way is fluidised bed, gear for parts. Commercially it's Electrically and some fluidised, Premelt is very uncommon due to performance of coat adhesion and finish.

If you want a special finish with long term life go for a metal spray (yes it's actually 100% metal) or ceramic.
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Clutch-monkey
 Post subject:
PostPosted: Thu May 12, 2011 10:00 am 
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Location: Brisbane
Hunter2 wrote:
Bought a new rear subframe for the 1980 Mini, had it powder coated and installed it in 1999. In 2003, stripped the Mini for major resto/mod and...powder coat came off the rear subframe in sheets with a garden hose.

Sand blasted the sub frame to bare metal, primed and painted automotive black...8 years later still good!

In my view powder coating is only of limited use in an automotive application, heat/engine/exhaust/brakes, cold/snow/salt/deicers, rain/sand/road grit/wind, oil/brake fluid/fuels, etc....not your living room ornament.

i got offered to have my subframes galvanised, would that be worth it?
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Morris 1100
 Post subject:
PostPosted: Thu May 12, 2011 10:20 am 
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Joined: Wed Jul 21, 2004 10:32 pm
Posts: 19124
Clutch-monkey wrote:
Hunter2 wrote:
Bought a new rear subframe for the 1980 Mini, had it powder coated and installed it in 1999. In 2003, stripped the Mini for major resto/mod and...powder coat came off the rear subframe in sheets with a garden hose.

Sand blasted the sub frame to bare metal, primed and painted automotive black...8 years later still good!

In my view powder coating is only of limited use in an automotive application, heat/engine/exhaust/brakes, cold/snow/salt/deicers, rain/sand/road grit/wind, oil/brake fluid/fuels, etc....not your living room ornament.

i got offered to have my subframes galvanised, would that be worth it?
No.
Australian subframes don't suffer from the rust problems that the overseas places do. Have you ever seen a badly rusted subframe in Australia? (I have, it was a very modified one fitted to a car trailer)
I would just paint it properly and let it last another 40 years!
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Clutch-monkey
 Post subject:
PostPosted: Thu May 12, 2011 11:58 am 
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Joined: Sun Mar 29, 2009 7:14 pm
Posts: 226
Location: Brisbane
Morris 1100 wrote:
Clutch-monkey wrote:
Hunter2 wrote:
Bought a new rear subframe for the 1980 Mini, had it powder coated and installed it in 1999. In 2003, stripped the Mini for major resto/mod and...powder coat came off the rear subframe in sheets with a garden hose.

Sand blasted the sub frame to bare metal, primed and painted automotive black...8 years later still good!

In my view powder coating is only of limited use in an automotive application, heat/engine/exhaust/brakes, cold/snow/salt/deicers, rain/sand/road grit/wind, oil/brake fluid/fuels, etc....not your living room ornament.

i got offered to have my subframes galvanised, would that be worth it?
No.
Australian subframes don't suffer from the rust problems that the overseas places do. Have you ever seen a badly rusted subframe in Australia? (I have, it was a very modified one fitted to a car trailer)
I would just paint it properly and let it last another 40 years!

but it wouldn't hurt would it? it's just that the guy offered to do both subframes for 80 bucks apiece with some other chassis work, and i'm a little pushed for time at home to paint them nicely atm.
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Morris 1100
 Post subject:
PostPosted: Thu May 12, 2011 12:13 pm 
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Joined: Wed Jul 21, 2004 10:32 pm
Posts: 19124
It could hurt. It depends on the temperature of the gal process. I have heard of problems with distortion with other things.
Talk to the guy and see what he says. He will have a better idea.
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Clutch-monkey
 Post subject:
PostPosted: Thu May 12, 2011 12:18 pm 
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Location: Brisbane
Morris 1100 wrote:
It could hurt. It depends on the temperature of the gal process. I have heard of problems with distortion with other things.
Talk to the guy and see what he says. He will have a better idea.

okay will do. i did hear about warping in the heat, but the guy works for a pretty top notch bodywork/painting workshop so i would *hope* that he knows what he is doing.. :?
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Morris 1100
 Post subject:
PostPosted: Thu May 12, 2011 12:24 pm 
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Joined: Wed Jul 21, 2004 10:32 pm
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Clutch-monkey wrote:
Morris 1100 wrote:
It could hurt. It depends on the temperature of the gal process. I have heard of problems with distortion with other things.
Talk to the guy and see what he says. He will have a better idea.

okay will do. i did hear about warping in the heat, but the guy works for a pretty top notch bodywork/painting workshop so i would *hope* that he knows what he is doing.. :?

If he stuffs it up remember it is only a subframe. You can always get another one easily enough. :lol:
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Hanra
 Post subject:
PostPosted: Thu May 12, 2011 12:37 pm 
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Joined: Sat May 08, 2004 9:01 pm
Posts: 6844
Location: Cairns, Nrth QLD
Clutch-monkey wrote:
Morris 1100 wrote:
Clutch-monkey wrote:
Hunter2 wrote:
Bought a new rear subframe for the 1980 Mini, had it powder coated and installed it in 1999. In 2003, stripped the Mini for major resto/mod and...powder coat came off the rear subframe in sheets with a garden hose.

Sand blasted the sub frame to bare metal, primed and painted automotive black...8 years later still good!

In my view powder coating is only of limited use in an automotive application, heat/engine/exhaust/brakes, cold/snow/salt/deicers, rain/sand/road grit/wind, oil/brake fluid/fuels, etc....not your living room ornament.

i got offered to have my subframes galvanised, would that be worth it?
No.
Australian subframes don't suffer from the rust problems that the overseas places do. Have you ever seen a badly rusted subframe in Australia? (I have, it was a very modified one fitted to a car trailer)
I would just paint it properly and let it last another 40 years!

but it wouldn't hurt would it? it's just that the guy offered to do both subframes for 80 bucks apiece with some other chassis work, and i'm a little pushed for time at home to paint them nicely atm.



Prob about the same cost as powdercoating!

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Clutch-monkey
 Post subject:
PostPosted: Thu May 12, 2011 12:41 pm 
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Joined: Sun Mar 29, 2009 7:14 pm
Posts: 226
Location: Brisbane
Morris 1100 wrote:
[
If he stuffs it up remember it is only a subframe. You can always get another one easily enough. :lol:

very true haha
Hanra wrote:


Prob about the same cost as powdercoating!

i suppose, i figured galvanising would be 'better' though..
had my wheels powdercoated, hopefully they stay looking good.

didn't mean to hijack thread lockie :lol:
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Hanra
 Post subject:
PostPosted: Thu May 12, 2011 12:46 pm 
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Location: Cairns, Nrth QLD
I had every piece of suspension and brakes powdercoated in 2002, still lookin good.

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simon k
 Post subject:
PostPosted: Thu May 12, 2011 1:11 pm 
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Location: Wodonga - Vic/NSW border
Hunter2 wrote:
Bought a new rear subframe for the 1980 Mini, had it powder coated and installed it in 1999. In 2003, stripped the Mini for major resto/mod and...powder coat came off the rear subframe in sheets with a garden hose.


I reckon you should have taken the subframe back to the powdercoaters for a warranty job - their prep must've been to blame...
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Morris 1100
 Post subject:
PostPosted: Thu May 12, 2011 1:17 pm 
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Joined: Wed Jul 21, 2004 10:32 pm
Posts: 19124
simon k wrote:
Hunter2 wrote:
Bought a new rear subframe for the 1980 Mini, had it powder coated and installed it in 1999. In 2003, stripped the Mini for major resto/mod and...powder coat came off the rear subframe in sheets with a garden hose.


I reckon you should have taken the subframe back to the powdercoaters for a warranty job - their prep must've been to blame...

I have never been happy with powdercoat on anything. It is the most over rated stuff around.
I prefer real paint and not electrically applied oven baked dust.
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Wombat
 Post subject:
PostPosted: Thu May 12, 2011 1:22 pm 
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Location: Sunny Shine Coast, Qld Australia
For things like subframes I reckon that a properly applied Kill Rust system is hard to beat. The epoxy top coat cures hard and glossy (or matt if that's what you want)

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My greatest fear in life is that when I die my wife will sell my Mini and tools for the price I told her I paid for them!
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Lockie91
 Post subject:
PostPosted: Thu May 12, 2011 3:36 pm 
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Joined: Mon Sep 01, 2008 12:51 pm
Posts: 2245
Location: Brisvages and the Goldie, the place to be..
Hanra wrote:
Clutch-monkey wrote:
Morris 1100 wrote:
Clutch-monkey wrote:
Hunter2 wrote:
Bought a new rear subframe for the 1980 Mini, had it powder coated and installed it in 1999. In 2003, stripped the Mini for major resto/mod and...powder coat came off the rear subframe in sheets with a garden hose.

Sand blasted the sub frame to bare metal, primed and painted automotive black...8 years later still good!

In my view powder coating is only of limited use in an automotive application, heat/engine/exhaust/brakes, cold/snow/salt/deicers, rain/sand/road grit/wind, oil/brake fluid/fuels, etc....not your living room ornament.

i got offered to have my subframes galvanised, would that be worth it?
No.
Australian subframes don't suffer from the rust problems that the overseas places do. Have you ever seen a badly rusted subframe in Australia? (I have, it was a very modified one fitted to a car trailer)
I would just paint it properly and let it last another 40 years!

but it wouldn't hurt would it? it's just that the guy offered to do both subframes for 80 bucks apiece with some other chassis work, and i'm a little pushed for time at home to paint them nicely atm.



Prob about the same cost as powdercoating!


correct there hanra. Powdercoating in this case would be slightly cheaper than clutch monkeys gal.
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Lockie91
 Post subject:
PostPosted: Thu May 12, 2011 3:37 pm 
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Location: Brisvages and the Goldie, the place to be..
Hanra wrote:
I had every piece of suspension and brakes powdercoated in 2002, still lookin good.


how often does the car get used? :lol:
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