rust prevention coatings

[Chorky]

Isn’t POR15 only for already rusted metal?

I don’t think it’s even that good of a paint(on clean metal)

I believe it’s not even UV stable and needs a top coat.(and yes I get the frame is usually in the shade . )


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No I think it is good for surface rust stuff. Probably not great for heavily rusted (flaking) things. I think your correct it is not UV stable

 

[DaveInDenver]

No I think it is good for surface rust stuff. Probably not great for heavily rusted (flaking) things. I think your correct it is not UV stable

You do have to knock the rust down so it's stable and not flaking. AFAIK no need to get completely clean metal, though. Certainly needs a top coat if exposed to sunlight.

 

[DaveInDenver]

I've never had it crack on me before, but I've never used it on a long wheel base rig. Based on what I've heard here, and some digging I've done since, I am going to try the Linseed oil on my rig. Proof that you can teach an old dog new tricks

Powdercoat is durable stuff but is a distinct surface unto itself and does not bond to the base metal like paint or linseed oil or lanolin (e.g. Fluid Film). The upside to powdercoat is it's tough but if there's any voids in the original coat or chips or scrapes exposing the metal then water can creep behind it and rust the metal. When it fails it breaks off in large chunks.

The belt and suspenders approach is to etch the metal with a phosphate first then use a primer before top coat of powdercoat. ARB does this sort of multiple step finish and I find their bumpers to stand up well. But I usually paint things now rather than powdercoat since it's easier to get a lasting finish not having the same access to do complex processes like they do, at least cost effectively.

 

[javajoe79]

I've built many vehicles and have used POR15 many times. It's best used up front and not later as a rust treatment but it does stop what rust is there when you apply it properly. In my opinion you can really do that unless you completely strip the frame or whatever you're putting it on, use their etching liquid and follow the instructions. Rusted or bare metal, it doesn't matter.

Lately I've been using products from Hy Tech in Florida. http://www.metalshield.com/ Their metal shield is a great option for an undercoating type of treatment. The bonus is that it also contains ceramic micro spheres for insulating properties. I used it to coat the underside of my NPR cab and I used their SC1000 http://hytechsales.com/prodsc.html inside the cab. The roof of my camper box will get their Bus shield membrane coating. http://hytechsales.com/prod2150.html