Does anyone do glass etching?

I am currently trying to take on to etching glass….and i am using the armour etching creme…and it doesnt look right after rinsing off…some spots on the glass look really good and some other spots look rough…like i did sponge painting or something….on it…i just bought the velvet etching creme…i havent tried it yet…but was just curious if anyone has any advice they could give me…i would appreciate it…and i have searched and searched the net and cant find anything….Thanks guys…. 🙂