Personally wouldn't use Armor All on my dog's out house.
For years have been using a silicone oil, and, or, a silicone grease depending on which I have at the time. Not the cheap silicone spray which comes in a spray can, that I use on my snow blower chute. If you can't find an oil or grease you can use the spray. Spray it on a small square of clothe and generously apply it to the gasket. Let sit for a while to absorb, than wipe with a moist (water) towel to remove the excess. Bob