Originally Posted by DBinMA
Does anyone know if I use a sealant or caulking on the screws when replacing these clamps?
I think that's a good idea. It may not be absolutely necessary but it's a belt-and-suspenders kind of careful approach. I would shoot a bit of sealer in each hole before installing the screws, so that some of it squeezes out around the screw head to block capillary action from wicking moisture into the area.
As to caulking versus some other sealant, I'll defer to others here who may have stronger advice. I would think for that application it wouldn't make a difference what kind of sealer was used.