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  #1  
Old 07-04-2009, 05:36 PM
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Alternative to POR-15

An interesting alternative to POR-15 is made by SEM, and I think they just came out with it. I bought some (at a pretty good price) from TCP Global. Although the specs are a little different (IMO, more conservative) it seems to me that it is basically the same stuff, except less expensive.

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  #2  
Old 07-06-2009, 05:46 PM
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Do you have a link to the product? I would like to look at the MSDS and see if I can figure out what the stuff is.
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  #3  
Old 07-06-2009, 08:10 PM
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bump

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  #4  
Old 07-06-2009, 11:17 PM
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i found it at tcpglobal.com, but others are selling it. The ads seem to imply that it's a "New product"...

http://www.tcpglobal.com/autobodydepot/por15.aspx
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  #5  
Old 07-17-2009, 09:51 AM
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I mean to the POR-15 alternative. I've already looked at the POR products MSDS and have a reasonabily good idea what they are.
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'12 Volvo S80 T6
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'18 Mazda Miata
No more boring cars for everyday transport!
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  #6  
Old 10-04-2009, 03:43 PM
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Rust-Shield is the SEM product that sounds closest to POR15 (actually more like Rust Bullet as there is no 'system'):

http://www.semproducts.com/Catalog.asp?prod=154
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  #7  
Old 10-04-2009, 11:48 PM
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I used a quart of SEM rust-shield to do the following on a 107:

1. Most of the insides of wheel wells, front fenders and fender/fender lips
2. Areas of the rockers where the original undercoating had peeled
3. Bad trunk seal area
4. Spare rear LH and center under-bumper parts
5. The LH of the above on the car
6. A small part of a door
7. The area around the front bumper "slides", LH/RH
8. The battery box in the trunk of the car
9. An entire spare fender inside

After doing the above (just barely) with a quart, everything was heavily gone over with rubber undercoating (several cans of body-shop grade stuff). I put it on while the rust-shield was still a fresh and a little damp, and I'm pretty sure it will stick.

After seeing just how fast rust can hit when the undercoating is undermined, I'm going to have to be on the watch for this from here on out.
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  #8  
Old 10-06-2009, 04:39 PM
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After looking at the MSDS of both products, my vote would be to use the POR product. SEM is a acrylic alkyd. POR-15 is MDI, which is an aromatic isocyanate.

I would suspect that the MDI would form a tougher film than an acrylic alkyd. It starts at a smaller molecular weight and builds with crosslinking. The aromaticity explains why you cannot expose POR-15 to UV, those types of polymers easily absorb UV. The aromatic rings make the material very hydrophobic, which should reduce rust.

Now, this is not conclusive. As I have said many times before, there is no substitute for real world testing. This is only an educated guess.

Has anyone had significant experience with both, and under what conditions.
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  #9  
Old 10-10-2009, 12:49 AM
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[QUOTE=jmk;2309738] SEM is a acrylic alkyd. POR-15 is MDI, which is an aromatic isocyanate.
QUOTE]

Yow, I woldn't SPRAY POR-15 without full positive-pressure protection! Brushed on, probably OK, but I'd wear nitrile gloves...

I think I'm on a year with one thing I used SEM on, and this will be the first winter with using it on the rockers/wheel well areas, so this should be a good test.
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  #10  
Old 10-10-2009, 12:41 PM
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It wouldn't be much more dangerous than any other 2k isocyanate. The big difference is that there is a lot more isocyanate in the formula.

It being aromatic vs. aliphatic means a couple of things: it has poor uv resistance, more hydrophobic, and quite a bit cheaper.

Now, wearing positive pressure is not a bad idea with any isocyanate.

It would be interesting to see how they would perform side by side.

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'18 Mazda Miata
No more boring cars for everyday transport!
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