Im putting in new larger exhaust tips, I plan on resin coating the new holes but still want to use a good sealer on the flanges. I dont plan on 5200 for obvious reasons, but Im not sure I want to use 4200 either.

I used 4200 back when I added my external hydraulic steering on the ram mounts and thru hull fittings both inside and outside the transom. I never trimmed the spots that oozed out from behind the mounting plates and today those spots are not in any way shape or form adhered to the transom both inside and out, they just flop. Im tempted to unbolt one of the cylinder mounts from the hull and see if the 4200 just falls off.

I use a really kick ass industrial RTV silcone from Kimball Midwest at work and the adhesion properties of this stuff has never failed to amaze me, Im thinking of using it instead of a "marine sealer" Any thoughts on this?