POR UV Sensitivity.....what happens

Z

Ziffer

Senior Member
I need to paint a steel handrail for my parents porch and want to know what will happen to the POR as it is outside in direct sunlight??

I know this is not car related but they can not get up and down the steps anymore and I want to do the job once and do it right.

Thanks
Z
 
My son painted a steel deck on a flatbed snowmobile trailer and it just went dull and powdery ...almost like flat black in no time...I would find something else if I were you...Good luck
 
I did a lot of my 34 body in POR-15, the underside, inside, and other places, but NOT the exterior surface. As noted above, it doesn't hold up - turns dull, and chalks. Check the directions - I think it was supposed to be covered with another coat of 'something'. In any event, I'm with oldskool, I think rustoleum is a much better product for durability and holding its look.

BTW... POR makes more than one material. Above comment is directed towards the original POR-15 - paint-it-over-any-old-rusted-metal. As an example of another POR material, I've used POR-15 Engine Enamel on a few engines - and it is an excellent product that is holding up well.
JMO
 
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Get a number, and call POR15, and talk to one of their tecs.

POR15 makes a real durable clearcoat to go on bare aluminum.

POR15 Does NOT make a clearcoat to go over the initial groundcoat,
but they DO make single part or 2 part gloss coatings to spray
over the original POR15 groundcoat, for UV protection.











.
 
Thanks for the reply, I'm not too worried about the color I just want to make sure it will not rust or flake off.

Z
 
That's great! I just spent the day prepping and painting a new front axle ,steering arms,spindles and a few other bits with POR 15......I though it was supposed to be the best thing since sliced bread.....now it looks like I'll have to paint it over with another paint.

I took really good care not to get it on my hands as it takes days to wear off.....my wife came home and told me I have some paint on my nose....they are right, it does not come off!
 
por 15 is a rust primer, not good in uv rays,, good underhood , underside,, they make a top coat for it,,, has to dry a few hrs , then put their top coat on it for uv protection,,,
 
What is recommended with POR 15 is to put a good coat of your favorite primer over the stillwet or at least tacky por 15. Has to at least be tacky or it won't stick. Then you can paint over the primer whenever you want. If you try to paint over dry por15 it won't stick. It is great stuff.
 
Henry Hopper said:
That's great! I just spent the day prepping and painting a new front axle ,steering arms,spindles and a few other bits with POR 15......I though it was supposed to be the best thing since sliced bread.....now it looks like I'll have to paint it over with another paint.

I took really good care not to get it on my hands as it takes days to wear off.....my wife came home and told me I have some paint on my nose....they are right, it does not come off!
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Should be okay on that stuff. I did the frame on my pickup with it with no topcoat and it's still glossy over a year later. I did notice it peeling in a few places. I'm not sure what that's all about...

My friend painted his frame with it and left it outside. When I stopped back over his house a week or two later it looked like it had been done years ago. When they say it doesn't like sun they mean it.
 
A far better product is SEM "Rust Shield". The SEM product is UV resistant when you use the catalyst with it. I have used POR-15 , under cars, but it does not seem to stand up, and it also hardens and goes bad once some air gets to it, and is mess to work with.
 
If you let POR 15 get chalky, then paint over it, will the paint stay on?



To store POR15 I put it in a glass jar, and fill the top of the jar with argon or CO2 from my welder before I tighten the cap - works great.
 
Ziffer said:
Thanks for the reply, I'm not too worried about the color I just want to make sure it will not rust or flake off.

Z
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Sinnce you're not concerened about color...

When I built hand rails for my folks, I used 3/4in (maybe it was 1/2inch) galvanized pipe and my trusty HF pipe bender...where I attached it to the cement, I threaded it and used a floor flange, masonary bit and those "expanding" things you knock into the hole and thread into...not the plastic ones, but steel ones.
 
Yoyodyne said:
If you let POR 15 get chalky, then paint over it, will the paint stay on?
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No. The top coat would need a good base to build upon. Chalky paint, regardless of type (regular paint, powder coat, POR15, etc), is not a good base.
 
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