This silicone is aquarium/terrarium safe and comes in a small, easy to use tube. I have used it around my animals to seal/waterproof enclosures and hides for years and it is completely safe once cured/you can't smell the acetic acid anymore. If you don't need a lot of silicone and don't want to fuss with a caulk gun, this is for you.

RTV adhesive has a myriad of uses. It's moisture resistance makes it well suited for shoe insole repair and attachment. Temporarily reattach a shoe sole. Attaches almost anything to smooth glass or metal surfaces. Reattach auto carpeting. Can be cast to replace fairly large odd shaped rubber seals like in a pool filter. Can be used to attach patches to work pants shirts (works best with patches on the backside) and is fully machine washable. Repair three corner tears. Repair a torn car cover. Reattach a book cover. Patch a beach ball or raft with a piece of heavy zip lock bag (almost invisible) Put a dab on screw threads to keep nuts from loosening (always removeable) Repair decorative ceramic, stone or brick. Reattach emblems to metal backings. Reattach magnets to souvenirs. I rated weatherproof as mediocre as RTV does not hold up long term when exposed to ultraviolet sunlight but works well outdoors when shielded from direct sun.

When sealing holes in a fiberglass shower, this has proven to provide great adhesion and water resistance.

Like it because it's 100 silicone. Clear and waterproof. Used it to mount new outside outlet cover.

Took apart my Timex Ironman watch to replace the battery and the super-thin o-ring was damaged. Put it back together with the new battery, went surfing for just 40 minutes, and water got in and made the screen half dead. Surprisingly, after drying out the watch it worked again, so I took it apart, tossed the o-ring and sealed it with this product and it survived my next 2 hour surf session, in much bigger surf, I might add, with one bit wipeout that worked me real good.