On the Cheap side, and having some left. I would usually run a bead of caulk around them and smooth out, and lay the subs, and run another on the outside.(PITA) when you have swapp a bad sub out, but thanks to a razor knife..... Old school installationDefinitely get some of this to put inbetween the back of the woofer frame and the enclosure to insure you get a good seal with the subs.
![😁 😁](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f601.png)