Headlight protection after compounding?

No he can't, trust me I've tried. But I respect it though

 

Didn't want to make a new thread, but have a question about urethane.

I assume its the same stuff you can buy at a hardware store like home depot and I notice there are some aerosol versions, can they be sprayed directly onto the headlight or do I need to buy the container and mix it with the mineral spirits?

 

I use the container form which is a lot to last like forever and have a gallon of mineral spirits