Sentry Solutions lubes any good?

I was just wondering if the Sentry products like Tuff-Glide rust preventative or the Smooth-Kote and BP2000 dry film lubricants were any good?
Anyone out there got any tales to tell?
Thinking about trying the Smooth-Kote and BP200 powder treatment on the bore of m 12G 870. How long before you need to re-treat? Work well etc.....

Thanks guys,

Ben
 
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