Traction tires or bullfrog snot?

[RobertInOntario]

For locos that require traction tires, is bullfrog snot a good alternative? A colleague said that it's basically the same thing as caulking,which would work just as well (and be cheaper?). Just curious if anyone can comment on these two alternatives.

Their website is quite helpful and it seems that Bullfrog Snot is easy to apply.
<!-- m --><a class="postlink" href="http://www.bullfrogsnot.com/howtoinstall.asp">http://www.bullfrogsnot.com/howtoinstall.asp</a><!-- m -->

Thanks, Rob