POR UV Sensitivity.....what happens

[Ziffer]

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

[Ford coupe]

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

[oldskool]

rustoleum is very good and lasts

[bobH]

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

[Lanny]

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.











.

[Ziffer]

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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

[Henry Hopper]

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!

[scooder]

I think you'll be ok with your front end stuff, ifs all underneath, not in direct sun light.
Martin.

[gundoca]

Tractor implement paint from Tractor Supply is good and is uv and chemical resistant

[1967gt]

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,,,

[packyusmc]

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.

[325w]

Hammer tone does good outside. Spray are brush on.

[linechaser32]

Por-15 will become chalky and will make your hand turn black.

[Automotive Stud]

Originally Posted by Henry Hopper

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!

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.

[russcc]

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.

[Ray Balukas]

Thumbs up for the rust shield. It is a one step product requiring less labor .

[Turdytoo]

Powder coating can be a solution but not all PC colors will stand UV's either.

[Yoyodyne]

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.

[Mike B]

Originally Posted by Ziffer

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

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.

[itslow]

Originally Posted by Yoyodyne

If you let POR 15 get chalky, then paint over it, will the paint stay on?

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.