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markeb01 · 09-13-2009, 12:09 AM

Everything I've ever read says never use etch primer under epoxy, they aren't compatible. Most professional web forums recommend epoxy primer on bare metal. It's main benefit is the ability to grip the metal, and what goes on top. It's recommended the epoxy go on first, even under body filler. I left my tailgate in PPG DP90 for 5 years and although it faded over time, it never allowed any rust to start.

09-13-2009, 12:09 AM	#20
markeb01 Senior Enthusiast Join Date: Feb 2007 Location: Spokane Valley, WA Posts: 8,356	Re: Intro and the longest build thread you'll ever see. Everything I've ever read says never use etch primer under epoxy, they aren't compatible. Most professional web forums recommend epoxy primer on bare metal. It's main benefit is the ability to grip the metal, and what goes on top. It's recommended the epoxy go on first, even under body filler. I left my tailgate in PPG DP90 for 5 years and although it faded over time, it never allowed any rust to start.