....silicone only works if the roof doesn't move....vibration and heat/cold will cause it to loose seal as will dust/water.....use a single part epoxy if you have the money and a butyl if you don't.....may cost $8.00 a tube retail and $4.50 wholesale pricing in case lots....will take 12 tubes and don't tighten the trim to the aluminum too tight or it will creep out leave at least 1/16 of an inch for the sealer.....like a gasket so to speak.....clean all surfaces with Denatured alcohol - not cheap Scotch it leaves a residue.....geofkaye
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