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Old 20-01-2018, 18:23   #1
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Painting engine

I have just rebuilt my 4cyl diesel using a rebuilt longblock. I would now like to repaint the engine and parts before putting it back in the boat. What is the best kind of paint to use and how do I prepare the parts/engine for painting? As part of the rebuild I cleaned everything with varsol to remove oil and grease and dirt etc., but there is still a greasy feel to the engine which I doubt is the best surface for painting. Is there a paint that can cope with an oily ground, or do I need to clean it again??
Thanks for the help.
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Old 20-01-2018, 18:29   #2
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Re: Painting engine

You need to get it completely degreased, a good solvent, paint brush and an air hose works well.
Then you have a choice, spray bomb or “real” paint.
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Old 20-01-2018, 18:40   #3
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Re: Painting engine

Over the years I've painted many engines and found that a good scrub down with Tide and hot water will clean them up enough for paint to stick. Only exemption would be a really greasy engine, But i'm thinking you have scrubbed and pressure washed the block, head and pan before the rebuild. I've used high temp engine enamel and regular Rustoleum brand spray cans and both work equally well. If the parts are bare metal then use a good brand of rattle can spray primer. Light coats dry faster and don't get runs.
Let each coat flash dry for 10-15 minutes then spray another light coat. I normally do 3-4 coats and let it sit in the sun for a few hours. It will get scratched and scuffed when you install it so have an extra can for touch ups. Enjoy the experience and bring out your inner Picasso.
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Old 20-01-2018, 20:40   #4
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Re: Painting engine

I've had good results with the motor-coater kit. Follow the instructions. It works out fine.

There's plenty of engine paint info on hot-rod forums.
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Old 21-01-2018, 10:39   #5
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Re: Painting engine

Great. Thanks for the info.
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Old 21-01-2018, 12:14   #6
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Re: Painting engine

Painted the engine in my Series Land Rover with POR engune oaint. Parts I painted with POR were still shiny like new after 10 years while parts painted with Rust Oleum were faded and chalky. POR paints are super hard and tough and love a bit of surface rust for adhesion.
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