What about double sealing? I often find myself pulling out the FS for a single mission and I want to make it worth while. So, I double seal both sides for good measure. I haven't had a seal failure in the past few weeks since I've been doing that. Worthwhile? I think so, even though a single seal on each side should work.
Weber Genesis, CyberQ Wifi on a BGE XL
Miss Silvia and Rocky