POR15 question
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Cross-Country
Joined: Feb 2006
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POR15 question
Yes, I did a search and couldn't find a direct answer to my question. I have a gallon of POR15 and was wanting to treat the frame on my 74 crew cab while the weather is nice. I've already put a wire wheel on my grinder and removed all the loose rust and scale. My question is, do I need to now grind off the hard rust that the wheel can't get? Or should I just apply the POR15 over the hard rust? Thanks.
Post Fiend
Joined: Jan 2006
Posts: 5,037
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From: Kasson, Minnesota
I haven't used POR-15 (I used another product), but it is designed to be painted right over rust. If you have removed all the loose rust particles and now all you have is just the hard rust, you should be fine. I used chassis saver and I painted it over some rusty parts to see how it would work (because the application stated it could be directly over rust) and I was impressed on how it covered and adheared. I would have to imagine POR-15 would be just as good or better.
ONe thing you could do, (I haven't) is to apply some of the paint on the inside channels or a spot you really don't see, let it cure and see how you feel about it. If you wanted too, you could also powerwash that spot and see how it holds up.
ONe thing you could do, (I haven't) is to apply some of the paint on the inside channels or a spot you really don't see, let it cure and see how you feel about it. If you wanted too, you could also powerwash that spot and see how it holds up.
Post Fiend
Joined: Jun 2004
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From: Joppa, Maryland
My dad did his '95 with it.. he just power washed and then painted, its holding up so far. The paint is formulated to bond to the rust, I'm not sure of all the specifics of the reaction, but you're basically supposed to just paint over the rust that isn't loose.
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Cross-Country
Joined: Feb 2006
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The can says not to use a rust converter. I thought that I would be okay with just painting over the rust, but its nice to hear it from others. I'm planning on doing the inside channels too, so that might be a good place to start and test a little. Thanks to all.
Posting Guru
Joined: Mar 2005
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From: western montana
Ive used por and they recommend the 3 step process of cleaning, using metal ready which converts the rust and then por-15. I would not circumvent that procedure.
The can might have been referrring to other converters- check their site- they have the scoop.
The can might have been referrring to other converters- check their site- they have the scoop.
Posting Guru
Joined: Mar 2005
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From: western montana
also- the sole purpose of grinding is to get rid of scale so that a layer of rust isn't able to hide from the treatment. All rust must be covered.
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Post Fiend
Joined: Jan 2006
Posts: 5,037
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From: Kasson, Minnesota
I like how POR 15 states it can be painted directly over rust and then it recommends the 3 step process. By the time its all said and done, you could have had someone blast it and then just paint it.
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Yeah, I read the "paint directly over rust" part, and now the stuff I did with POR is rusting through. The stuff I took my time on and did with Rustoleum is still fine. I should have save the $38 a quart for the POR...
Lead Driver
Joined: Aug 2003
Posts: 6,305
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From: Boulder Creek, Ca
Like the 'Marine Clean' Por offers. Use it before taking wire brush to frame. Couple spots took grinding wheel where rust was serious. Then used the 'Metal Ready' and finally pressure washed before applying paint. Sprayed on couple coats, can be diluted w/ their 'solvent'. Rec. topcoat if area painting is going to be exposed to sun, will fade to flat blake appearance. Applied about 5-6 years ago and still holding up. Have try different products and currently trying another, using the 'Rust Converter' and 'encapsulator' sealer before applying the topcoat. IMHO the rust eventually going to win out regardless of what system one uses and 10 yrs is about the best I have gotten.
dave
dave