Best sealant for exterior stove vent?

We want to redo the sealant around our exterior stove vent on an 08 airstream. I see that parbond comes in an aluminum color but I want to use a product that will remain somewhat elastic when cured so vibration doesn't cause it to crack.



What product is best for this sort of thing and what do you use to clean it up so the new seal doesn't show?

Thanks.