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Author Topic:   POR-15 failure

Posts: 25819
From: Saco, Maine
Registered: May 99

posted 10-25-2002 06:17 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
Here's a little something to file in the knowledge base:

My friend beadblasted the battery tray in his car, then cleaned it with metal prep and painted it with POR black. He just noticed that after a year the POR is flaking off and powdery rust is underneath. The car is rarely driven in the rain, and he was pretty sure he cleaned it effectively. {the only thing I probably would have done differently is that I would have washed it with baking soda before I even beadblasted it.}

Granted, a battery tray is one of the harshest environments on a car but so much for POR being indestructable.
I thought it was ironic that POR uses a battery tray on their print ads.

'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150

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Posts: 5012
From: So. Fl.
Registered: Aug 2000

posted 10-25-2002 09:47 PM     Click Here to See the Profile for mellowyellow     Edit/Delete Message   Reply w/Quote
THe instructions on the Por 15 can states that bare metal should be roughed up with 40 grit. If over rust, what it's formulated to do, it will have teeth to grip. They do not reccommend some metal preps such as phosphoric based acid preps. Over fresh metal, would not use it as it's really designed for use over rust. Por 15 is an epoxy product, am sure. In using a two part epoxy product called Fasco, it peeled off when I forgot about phosphoric acid being on surface. Bondo is the same way.

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Just Strokin

Posts: 450
From: Tuscaloosa, Alabama
Registered: Dec 2001

posted 10-25-2002 11:01 PM     Click Here to See the Profile for Just Strokin   Click Here to Email Just Strokin     Edit/Delete Message   Reply w/Quote
What is sounds more like, is he didn't get all the glass/sand out of the metal and the POR lifted. This is a real problem when you have a car/panels sand blasted or soda blasted.

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