C10,
I have used more of that stuff than I would like to admit. If anyone has any suggestions for a SS that would be affordable for this type of work, I would be all ears. I would really like to get away from using the Tractor Supply Valspar paint if I can afford it.
To answer your question, I have not noticed a difference in gloss with or without the activator. However, that stuff needs all the help it can get with curing (it is really slow, even with hardener). Tractor Supply does sell the hardener, and naptha (you will need this to thin it.) I have found that the correct amount of reduction is very important. I will have to check my notes, but I think it works best for me with about 25% thinner. Also, don't plan on coverage with your first coat. Another tip: don't use their crappy primer for anything. Use SPI epoxy and have piece of mind that you have a good foundation that will keep your machine from rusting (and it can be sanded).