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Old 03-20-2008, 10:31 AM
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Engine Painting

I'm getting ready to reassemble a refreashed motor. I am planning on using POR 15 to finish the block, heads, etc. When is the best time to paint the parts? Before assembly or after?

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Old 03-20-2008, 10:37 AM
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I've painted with a brush before assembly and I've painted with spray after assembly. Whatever turns your crank,I guess.
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Old 03-20-2008, 11:33 AM
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I'd paint before assembly. The engine will look more detailed.
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Old 03-20-2008, 02:14 PM
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If the engine will spend a lot of time exposed (car shows, or maybe it's in a T-Bucket) POR-15 might be a poor choice. Unless you use a secondary topcoat. POR-15 is sensitive to UV (sunlight) rays. Not slamming it, I think it's a great product. But they are careful to tell you to use it in applications that are nto exposed to UV, unless you topcoat over it.

Pat
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Old 03-20-2008, 02:19 PM
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If you are painting it black I would say after assembly, that way you can be sure to get all the little areas that are not covered, there are spots that will be left bare around the deck of the block and around the intake faces of the heads that will have to be filled in anyways if you paint the parts individually
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Old 03-20-2008, 02:31 PM
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I would vote against POR-15. Once it sets, it turns to concrete and makes any mistakes a headache.

I always paint after assembly. Less masking.
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Old 03-20-2008, 02:44 PM
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I paint after assembly because I think its easier. Restoration freaks tend to paint before assembly because it is more authentic, but it requires more masking and attention to detail.

I agree with the others; unless you're doing a special POR15 engine paint, I wouldn't use it. Its great as a rock hard topcoat for rust, but you'll have to topcoat it and I don't think its best on hot engine parts. I have great luck with Eastwood rattle cans of engine paint, and actually the parts-store brand is just fine as well.
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Old 03-20-2008, 08:36 PM
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A high quality epoxy primer followed by automotive Single stage urethane gets my vote.
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Old 03-20-2008, 09:24 PM
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Quote:
Originally Posted by baddbob
A high quality epoxy primer followed by automotive Single stage urethane gets my vote.
Nailed it better than any off the shelf engine paint i've ever used
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Old 03-21-2008, 05:39 AM
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I vote against the POR-15 also. It's just not the right application. I've had good luck with can engine paint, but epoxy/bc/cc is the way to go. The clear coat makes it super easy to clean. Some engine degreaser and good hose down and the the grime rinses away.
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Old 03-21-2008, 10:20 AM
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Thanks for the feedback. I know I can always count on my fellow car nuts to give me the straight scoop. I think I'll paint before assembly because I want the detail to show. I think I will go the bc/cc approach over an epoxy primer. I don't plan on tearing into this motor again for quite some time and I want it to look kick ___. Thanks!
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Old 03-21-2008, 11:58 AM
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Quote:
POR-15 might be a poor choice
HUH? The only reason I've ever heard of anybody not using POR-15 was because they thought it cost too much. What is the problem with a product that works? Check out the POR-15 web page;
http://www.por15.com


not a paid advertiser/endorser of any known product
Anyway, anybody that doesn't care for the POR stuff, all I can ask is WHY?
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Old 03-21-2008, 12:01 PM
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Quote:
Originally Posted by Stroke
HUH? The only reason I've ever heard of anybody not using POR-15 was because they thought it cost too much. What is the problem with a product that works? Check out the POR-15 web page;
http://www.por15.com/prodinfo.asp?grp
=EE&dept=7



not a paid advertiser/endorser of any known product
Anyway, anybody that doesn't care for the POR stuff, all I can ask is WHY?
Ever got that stuff hot? Smelt the fumes from it burning? Tried to put it out when on fire?

Nuff Said
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Old 03-21-2008, 12:12 PM
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Have smelled more than my share of POR.
Quote:
Tried to put it out when on fire?
Um, once cured it would likely have to get VERY HOT to burn. Why is there fire under your hood anyway? That doesn't seem to make for a very nice engine compartment, at least none that I've seen.
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Old 03-21-2008, 12:58 PM
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jpd37,

You need to clarify. Are you wanting to use the black POR-15 rust paint? Or the POR-15 engine enamals they also sell?

I, like the other posters had the impression you were using the rust paint they are so well known for. If your talking about thier special engine enamal, I have no experiance with it, but I would retract my statement about it being the wrong application.
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