Should we POR15 paint on rear brake drums? Yes or no? - JeepForum.com
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Unread 08-08-2013, 11:58 PM   #1
Charley3
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1999 XJ Cherokee 
 
Join Date: Mar 2013
Posts: 3,768
Should we POR15 paint rear brake drums?

My cousin is cleaning and prepping my rusty areas of underbody, frame, drivetrain, and suspension parts before painting them with POR15?

What about rear brake drums? They are very rusty. We'd like to remove them, and prep and paint them with POR15, but we have heat concerns.

How hot do drums gets? (I drive in mountains a lot.)

Would the heat damage the POR15 paint?

Would the POR15 paint be to much of an insulator and cause drums to overheat?

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Unread 08-09-2013, 01:38 AM   #2
dave564
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If they are very rusty, they are probably very old. I don't know anything about POR15, matter of fact I had to Google it to see what you were talking about.

The rear brakes make up only about 30% of your stopping force, that is one of the reasons they last so long, unless you are towing. As far as heat I would not sweat it.

HOWEVER they will wear out sooner or later, and will have to be replaced. I personally would not put such an expensive paint on a part that is designed to be sacrificial.

If you are really worried about the looks, invest in new drums, and hit then with cheap spray primer and the color of gloss spray paint you wish.

Durable items like body and suspension components, yes get the good stuff, for brake drums go cheap.
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Unread 08-09-2013, 01:50 AM   #3
Holder350
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You can prep and paint them with caliper paint and it won't bake off. I've done it on several sets.

They look very nice painted black.

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Unread 08-09-2013, 06:07 AM   #4
bobthecatkiller
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My brake drums are coated with chassis saver. I didn't really care how my drums looked, since I will be upgrading to disc soon but I had extra chassis saver and you can only save it for a few days after its opened.
Anyways it hasn't had any problems and its held up well.

Btw. Chassis saver is chemically the same as por-15
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Unread 08-09-2013, 09:58 AM   #5
Charley3
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My drums are 14 years old and very rusty because Jeep from back East (salted roads).

However, it only had 33K miles on it back East and 3K miles on it in the West. So low mileage and I expect will last many more years.

Based on advise from this thread, I'll save them for last and paint them with left over POR15, if there is any. If no POR15 left, I'll rattle can prime and paint them.

I live in a wet climate, but no salt on roads here. So I expect rust won't get worse, if get it under control.
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Unread 08-11-2013, 05:43 AM   #6
Fury3
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Will painting the drums force them to retain more heat?
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Unread 08-11-2013, 06:09 AM   #7
bobthecatkiller
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Quote:
Originally Posted by Fury3
Will painting the drums force them to retain more heat?
I don't know, maybe?
I haven't had a problem. How much braking does the rear brakes do anyways? I don't know much about brakes besides how to replace them, but I'm pretty sure the front brakes do 90% of the work anyways, so how hot can the drums really get?
You can extend gas milage and brake life by coasting when ever you may have to stop, I find most people like to try to gun it to every stop sign and light, it's not always necessary to get up to the speed limit if your not on a main road or highway. This will inevitably keep your brakes cooler, although like iv said, I haven't had a problem with heat.
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