Originally Posted by Gomezy3k
And DIY involves what exactly? I was thinking of perhaps some kind of silicone or similar type of caulking.
Please don't use silicone when caulking surfaces that have even minimal movement. The silicone will pull away from one of the surfaces. Look at flexible, exterior caulks. Remove any old caulk and start with a clean, dry surface. If the opening is to large, use of a "backer rod" may be required. This is a foam strip that acts as a filler. Color match the areas and don't smear caulk all over the surface, you just want to form a bond between the 2 mating surfaces. Get a good quality caulk gun, hope this works for ya.
Also, when you purchase the caulk, make sure it is compatible for the surfaces you are working on.