There is still a lot of block sanding and bodywork to do on the car before it is ready for paint....and the hood, deck lid and fenders haven't even been started yet....but lately I have been ignoring these issues entirely and enjoying this view of my car again:
What I have been doing is working on restoring some more of the smaller parts that I will (one day) use to rebuild the car. I started by examining some of the parts I restored about a year ago. I used POR-15 to paint the rear axle housing and some of the brake parts, and I also used it on a few other items....like the door hinge mounting plates, and the brackets that go behind the rear valance. Inspection of these items showed evidence of bubbling at the paint surface, although it wasn't all that bad....
But when I checked out the leaf spring locator plates, it was worse: actual rust inside the bolt hole!
On the rear bumper internal brackets there was a huge bubble in the paint and an area where it had peeled off
When I skimmed over the surface with the wire wheel, I found the underlying metal thick with rust - it certainly wasn't like this when I painted over it!
So what's all this then? Well, I was sceptical about POR-15 even when I originally used it on the rear end, because I've heard so many people, both personal friends and on the net, saying that it peels right back off. However, the manufacturers general response to this seems to be that it only peels off if you get water into the product....or in other words, if it peels off, you mixed it wrong. OK, so I have a past life as an organometallic* chemist (can I admit that here?), so I understand exactly what it means to exclude air (and thereby water vapor) at the parts-per-billion level....and I'm confident I did more than enough when I used the POR-15. And it still peeled off. And not just on one part, but on most of the stuff I painted. So I rest my case as this: "POR-15 is rubbish. It's worse than useless in fact." I'm not claiming I'm the first person to say this (lol, probably not in the first 100,000!) but I'm adding my voice :)
(*Next time out I'll be reporting my own experiences on the chelation approach to rust removal so watch this space)