Leave the EDP alone. There is no need to sand it off. IF you have to prime it simply scuff it a bit with ScotchBrite and shoot the primer. I would insulate after the installation. There is no benefit from going under the braces and you will see no difference in sound quality.
Mark
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"Bad Ast" Astro Van Pro-Touring Project.... Heat, beat, file to fit, paint to match...
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