It appears Watkins is high percentage DEET, which works well for us too. Just try to use as little as possible. We buy the Walmart brand called Repel which is cheaper and DEET is DEET no matter the name on the container.
We use Thermocell which works great if it is calm. We have the backpacker version which has a small butane canister and will sit on the ground without falling over.
Citronella candles seem to work too, although not too well.
No seeums in the Keys are a bigger problem than mosquitos for us. A combination of the above usually works or it is time to go inside :)