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Old 27-02-2014, 18:31   #16
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Re: Engine painting fail

Originally Posted by minaret View Post
No primer? No acid etch? Doomed to failure. Can't paint cold metal either. Must be dry and warm. Primer must be applied within 45 minutes of abrasion and final cleaning. Blow all that paint off with a pressure washer and start over.
+1 to minaret's advice.

If you're stuck with painting in situ the key is to ensure all rust, dirt and oil is removed. With an acid or caustic cleaned block this is pretty straight forward. MEK or Toluene always worked well. You can tell if its clean by wiping with a white cloth. Any dirt will lift the paint.

A good high gloss enamel always works well. Most engines have quite rough castings and some porosity so enamel laid on thick is the key.

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Old 27-02-2014, 18:36   #17
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Re: Engine painting fail

Certainly use an air dryer when spraying paint, but I'd be surprised if just dusting it caused rust. Cold block, humid environment.. like a sealed boat with a person breathing in winter maybe?

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Old 27-02-2014, 18:59   #18
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Is there any sort of oil or something i can use to prevent any more rust during winter? winter is about 17c here
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Old 03-03-2014, 12:34   #19
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Re: Engine painting fail

I wouldn't be worried about the rust being removed as I would be worried about it being dried and converted. Here's what's worked for me:

-I clean it thoroughly with a heavy degreaser, like purple power or simple green letting it soak a little bit
-wash it off
-Dry the block with acetone and a rag
-Then I remove the loose pieces of rust with a wirewheel or whatever you have that you can get in the small areas, a screw driver ect
-Clean it with acetone and a rag again
-Convert the rust with Ospho. Sometimes it will take more than one round
-Paint it with a good rust paint like POR-15
-Top coat it with whatever you want

Watch your metallurgy and avoid hitting non ferrous metals with corrosive products like the ospho.

Cast Iron is very porous and takes some convincing to get the oil off of the surface sometimes. A good paint job is all in the prep work and with you ending up with creaky worn out joints.
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Old 03-03-2014, 12:58   #20
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Re: Engine painting fail

Tremclad (canada), Rustoleum (us) rust paint. No primer, 16yrs, no fail.
Cheapest paint you can buy.
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Old 03-03-2014, 13:10   #21
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Re: Engine painting fail

Spray it with Ospho or other metal prep, let dry and paint. Will work as long as there is no flaking rust. POR 15 makes a great engine paint that goes on over rusty engines as prepared above. Painted the Series Land Rover engine 15 years ago and it still looks great in our salty environment.

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