To POR15 or Not

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rklein383

rklein383

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I have my 71 Barracuda on its side working on the underneath and would like some opinions on if I should POR15 (or some other product) the bottom.

I have heard some good things about POR15 and some not so good.

Please let me know if you like the product.

thanks,
Rod
 
Some like using the Lizard skin after getting the underside prepped. Por15 is a good product for the inside;not too sure about the underside.I used it o the inside my 79 Z28 when I restored it & it worked great. Used NAPA brand undercoating for the underside.
 
Just remember that if you use POR15 on the exterior, it has to be top coated because UV light will break it down.
 
Use POR15 as directed then switch to POR15 Chassis black and continue undercoat.
Use POR15 as directed and apply lightly with primer when tacky.
This process shouldn't chip from stones or what have ya. It's not necessary to do the entire underside.

Replace rot with metal.
 
a friend had to do some floor pan work for a client about 2 years ago and they were coated
with poor-15
...he is still cursing that stuff!
 
If you want to deal with POR 15 comming off in sheets, go ahead and use it. You cannot go wrong with epoxy primer on the underside of your car. You can paint it body colour, with out scuffing, if you paint it in the time window. I would not use POR15, its an expensive gimmick product that is real finicky to apply. Just my 02.

barracudadave67
 
The por15 is very particular about prep! If you do not use the three stage process it will peel like a bad sun burn
 
barracudadave67 said:
If you want to deal with POR 15 comming off in sheets, go ahead and use it. You cannot go wrong with epoxy primer on the underside of your car. You can paint it body colour, with out scuffing, if you paint it in the time window. I would not use POR15, its an expensive gimmick product that is real finicky to apply. Just my 02.

barracudadave67
Click to expand...

I am leaning towards not using it. In the past, I have used RustMort to make an oxide layer, prime and paint as normal. It seemed to work good.
 
rklein383 said:
I am leaning towards not using it. In the past, I have used RustMort to make an oxide layer, prime and paint as normal. It seemed to work good.
Click to expand...

this is a good plan. use epoxy and be done.
 
In my experience with it, it only works on VERY porous rusted metal, but works very well on that and can be topcoated. You have to topcoat it when it is still tacky. If you put it on new steel or clean steel, it will peel I don't care how much prep you do. It is the chemical bond with RUST that makes it work. Great for inside of surface rusted rockers, doors, frame rails etc. if you are just trying to prolong the life of very pitted metal. Wire brush, paint it on, done. I have put it on rusty parts years ago and it is still there...
 
barracudadave67 said:
if you want to deal with por 15 comming off in sheets, go ahead and use it. You cannot go wrong with epoxy primer on the underside of your car. You can paint it body colour, with out scuffing, if you paint it in the time window. I would not use por15, its an expensive gimmick product that is real finicky to apply. Just my 02.

Barracudadave67
Click to expand...

x3.......
 
Shoot it with rustoleum rust reformer paint.Then coat it with rustoleum under coating.It lays down nice.The good thing is you do not have to scuff the rust reformer before applying the under coating.I wish i had done this before wasting a bunch of money on east wood products.Try it on a piece of metal and you will see.
 
I used rustoleum primer followed by herculiner and had great results. I had to do some minor welding and required a grinding wheel to take it off and was cursing the entire time. Very durable and I would do it again.
 
Everything has it's place where it works really well, but POR15 wouldn't be my choice as an underside coating.
Better off to paint it body color or use a good thick nasty something. :D

A member here told me one time that his Father used to say that the best metal on the car is the metal coated with grease and oil.:D
Not that I recommending grease and oil literally of course.
 
RustyRatRod said:
Just remember that if you use POR15 on the exterior, it has to be top coated because UV light will break it down.
Click to expand...

I doubt there is any UV light underneath the car. If the underside of the car is exposed to UV light, he has bigger problems!
 
Rocky65 said:
In my experience with it, it only works on VERY porous rusted metal, but works very well on that and can be topcoated. You have to topcoat it when it is still tacky. If you put it on new steel or clean steel, it will peel I don't care how much prep you do. It is the chemical bond with RUST that makes it work. Great for inside of surface rusted rockers, doors, frame rails etc. if you are just trying to prolong the life of very pitted metal. Wire brush, paint it on, done. I have put it on rusty parts years ago and it is still there...
Click to expand...


You have to use their Metal Prep on bare metal.
 
I would NOT recommend it. I used it on my Dart. Rust coming back through in just over a year. I follow the directions to the letter. One quart with all the additives was about $70 down the drain as far as I'm concerned.

Best rust inhibitor I have had experience with was Red Oxide primer from TSC.
I painted an old used rusty basketball pole up in 2002. Entire surface was solid surface rust with a little pitting. A light bit of brushing, red oxide primer then black top coat.
I didn't see even a hint of the rust coming back for over ten years. Just now starting to look a little bad 14 years later.
 
lilcuda said:
I doubt there is any UV light underneath the car. If the underside of the car is exposed to UV light, he has bigger problems!
Click to expand...

You should research it. UV light on a sunny day is pretty near everywhere.
 
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