Originally Posted by willwren
You want RTV rated for body and trim adhesive/sealing. Usually black.
The only issues I have with using RTV like that is if you get too much and it gets squeezed out (making a bit of a mess to get a neat looking seam) and getting it off the paint later for you take the part off the body. (as a sealant, it will work well..I'll give it that
) I just have trouble guessing how much to use to get it to squeeze out into a nice, neat, bead on the seam of the parts.
Another option for a replacement seal when the OEM is out of production is to make one out of inner-tube rubber. Cut out a new gasket from the rubber using an X-acto knife and whatever is left of the old seal as a template.