Way Outta Control
Join Date: Sep 1999
Location: The Palouse
Thanked 3 Times in 3 Posts
Review: POR-15 after 1.5 years of use.
Some of you may be interested in how the POR-15 has held up over the last year and one half in the Great Salted MidWest. When I rebuilt the tub I put 3 coats of POR-15 on the underside and inside of the tub, as well as on the frame and rear crossmember. Bear in mind that proper prep work had been done according to Restomotive for each of the areas.
Here's how it's worked out:
The POR-15 did not hold on the floorboards. Within three weeks it had lifted up, exposing bare metal underneath. I was never able to get the coating to adhere to this area and finally resorted to conventional undercoating and painting.
The rear flooring held up very well with no lift and was rust free through out the time period.
The underside of the tub was a surprise. The POR-15 held up extremely well on the underside of the tub. The area coated was the entire underside, minus the transmission hump. There were NO rock chips in the fender well area. I took an air driven drill, attached a rotary wire brush and while pressing hard, move the brush repeatedly over one area on the underside, rear floor area. The abraiding was not able to breach the PRO-15 through to the bare metal.
I coated the frame from the cowl back. Only in areas did the POR-15 seem to inhibit the rust. As you can see from the posted picture, the frame still flaked. I assume that the POR-15 metal etch and POR-15 could not penetrate enough into the oxidized layer. Were I to rate this on a 1 to 10 scale, I'd have to give POR-15 about a 3 to 4 rating. I was not pleased with its robustness on the frame.
3. The Rear Cross member:
The coating held up fairly well on the rear crossmember and the tail sections of the frame. I have no complaints at all about it's ability to protect the crossmember from futher rusting.
Would I buy POR-15 again? No, unless I were coating a new, bare metal, frame. From what I have experienced, POR-15 did an excellent job protecting properly preped New bare metal in non high wear areas. In areas of oxidation, or high wear, it flaked and would not adhere or did not stop the corrosion. In my opinion, were I to obtain results uniform to those of the underside of the tub, I would not hesitate to purchase POR-15 again. But because I was not able to see uniform results with the three application areas, I will look for a different product.
Last edited by LEVE; 03-24-2009 at 07:46 PM.