I have a funny story.
I used the Turtle Wax kit this winter. Halfway through applying the clear solution (wearing gloves) my glove tears and i get some on my left hand. It immediately begins to turn red and hurt.
By the time I get inside, the redness and itching has traveled up my arm, to my chest and face. I jump in the shower and wash up and by then I have hives almost all over my torso and arm and down my backside. No problems breathing thankfully!
It clears up in an hour or two. Now I have never had hives or a bad allergic reaction to anything like this before. Imagine my surprise when it happens again the next day, and the next, and the next.
No Common triggers. We analyzed everything I ate, touched, and wore, nothing new. Turns out that I had developed Hives due to the cold weather, called Cold urticaria. Every time my core temp dropped and my skin came in to contact with cold air, I would get hives immediately. Warming up caused them to go away.
Most likely, the allergic reaction to the headlight solution triggered an immune system problem which triggered the Cold urticaria to develop. It lasted most of the winter, getting less and less severe. Luckily, it hasn't happened at all during the summer (even when swimming in the cold ocean water). So I'm hoping the worst of it is behind me.
TL;DR- headlight restoration solution gave me hives all winter long.