Since you are bolting the plates in, do you need adhesion? I've sealed up things before by putting sealant on one side and wiping a thin layer of grease to the other. Makes it seal up but also come off if needed. I'd think that the bolts would be the what keeps it in place and any sealant used would just seal and not need to provide adhesion. Think of it like a rubber gasket. It doesn't stick, but when clamped tight, it seals. I'd leave the bolts loose but just snug until the silicone cures, then clamp them down. Or maybe just buy some rubber gasket material.
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1971 Potter built center console.
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