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Author Topic: Protect paint from moisture  (Read 3982 times)

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Protect paint from moisture
« on: October 24, 2009, 03:09:00 AM »
Probably not the best place for this, but I suspect it have interest for many.

I am painting (90% done) a machine with standard synthetic paint, due to availability and price (probably I have started bad ...). This machine was indented to work primarily with compressed air to remove chips. But now I will use for sure water/oil moisture that will quickly ruin my paint job (and what a long job it was).

My question is what can I apply to protect the paint (new paint) from moisture? Varnish will due? any special material?

Thank you.

Offline RICH

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Re: Protect paint from moisture
« Reply #1 on: October 24, 2009, 07:56:49 AM »
Not all paint is the same. Some are impervious. Most of the two part epxoy paints are realy tough. Water and  moisture are tough and you can just look to the automotive industry and you will see manny choices but application, substrate and topcoating all go hand in hand in preventing rust or corrosion. Proper application is a must and cost is high. But you have already covered the metal and frankly your stuck, somewhat ,with what you did.

I would recomend you an epoxy grey enamel appliance paint which is not all that expensive and a quart goes a long way. It has held up extremely well  for me.  Outside Emron ( $8-10 a spray can) is very good and if prep'd properly and adaquate coating is applied can last a long time. Por-15 is fantastic directly over rust, but at $35 a quart you should get something for your money ( no comparison to say "Rust Oleom") but is not good from a UV point /
sunlight.

Quess what i am saying is you may have started bad, but you can refinish rather quickly since most of the labor was in prep work. I would recomend you do it now and not put crap on something that may have been inferior to begin with.
That's my nickle,
RICH

Offline Chaoticone

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Re: Protect paint from moisture
« Reply #2 on: October 24, 2009, 01:32:52 PM »
Rich is spot on. Sherwin Williams sells some really good 2 part epoxy paints that work well on machines too. Do yourself a favor and bite the bullet. If the coolant and paint are similar to the ones I have seen used you will have paint peeling within a week.  As it is now you may be able to let your paint cure good and apply epoxy over it. You may be able to force this with heat. Might also be able to get a sealer to seal the synthetic and promote adhesian of the epoxy. The best person to answer that is a paint rep. from what ever supplier you use. To me, good paint is much cheaper than the time it takes to prepare for and apply it.

Brett
;D If you could see the things I have in my head, you would be laughing too. ;D

My guard dog is not what you need to worry about!
Re: Protect paint from moisture
« Reply #3 on: October 25, 2009, 02:12:35 PM »
I'd agree with the above - preparation is everything.

Epoxies are very resistant tp petrochemicals, and a good epoxy primer will be key to a long coating life. Finish off with an epoxy topcoat and you're good to go. Sunlight/UV aren't an issue in most workshops, but avoid bright red if it's going near a window - reds fade faster than other colours.
Re: Protect paint from moisture
« Reply #4 on: October 26, 2009, 03:15:05 AM »
Thank you for replys. I will speek with my paint representative.
Machine is red. From all colors it had to be red ...

Filipe

Offline RICH

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Re: Protect paint from moisture
« Reply #5 on: October 26, 2009, 07:44:37 AM »
Filipe,
Come on now, add a little zest to you machining!
RICH  ;D
Re: Protect paint from moisture
« Reply #6 on: October 26, 2009, 01:07:32 PM »
I would had painted pink if my wife would like the machine, but not even pink she would like to know anything about the machine, so it was red. ;D