Questions (2)  

Question: Will these work on the flame booster cans since they're a male valve i got one of these caps for free with my order but the only cans i have that are male are rusto 2x rusto turbo and a couple flame booster cans
ArtPrimo: We have not tried them on the Booster cans. If you do, let us know how it goes. They're designed for Valspar.

Question: Greetings AP,

I recently ordered 50 of these caps and am trying to figure out exactly what type of rust cans these can primarily work on. I know the sizes of the nozzles may differ but is it primarily on Rusto 2X cans, or the standard Rustos that these caps fit? I'm most likely going to take a trip to a few stores with these caps with me and see what fits what; I'll post my findings here to help others. Basically I'm trying to figure out if these caps are compatible with a certain series of Rustos, or if it's down to each can and color.
ArtPrimo: These work well on Krylon and Valspar. Unfortunately they will not work on Rusto.