Do I have to prep the surface since I've used my grill several times?

Yes, the grease and oils from cooking will effect the ability of the sealer to adhere to the surface. I used a spray degreaser and a stiff bristle brush and then finished with rubbing alcohol on a paper towel.

Is this applied inside or outside the smoker?

Either one would work. The best application is inside the smoker so that the sealant isn't seen from the outside.

would this seal on a granite counter top joint?

As a contactor that lays counter tops I'd use a non-sanded grout with a latex mixing compound. It shouldn't take much.

Can it be used to adhere silacon feet to the grates of a cooktop?

It should work fine as long as it is not expected to actually provide support.

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🔧 Seal the Deal with Style!

DIY DREAM - Self-curing and easy to apply, perfect for both pros and DIY enthusiasts.
HEAT WARRIOR - Withstands temperatures up to 350°F for high-performance sealing.
VERSATILE BONDING - Bonds effortlessly to most surfaces for versatile applications.
ALL WEATHER CHAMPION - Impervious to all weather conditions, ensuring durability.
SEAL WITH CONFIDENCE - Food contact safe and FDA grade for peace of mind.

The Silicone RTV 4500 FDA Grade High Strength Silicone Sealant is a versatile, food-safe sealant that withstands high temperatures and harsh weather conditions. With its easy application and strong bonding capabilities, it's perfect for both professional and home use.