Two common adhesives found in the aquarium industry, but I’m not going to go over the differences and when to use them. I'm going to teach you a trick.
Silicone grease, not adhesive, is often used on O-rings and flanges, like in your RO unit. You can find the FDA grade at most home improvement stores. Did you a dab of silicone grease over the tip of your super glue will keep the cap from getting stuck on. Great when you buy the huge bottles of Coral Glue to keep you from gluing the cap on before you are done with the bottle. Happy reefing everyone.