I've been had!!....
 or is it    - I've been made!!   (?)
 well,    -  I've been found out for sure!!!
 Nothing gets by Karen - that's for sure - she is too good!  crystalball@
  OK. lessons learned,  - I would never use tar again for my car...
  cause now I got this! - 

 Flashing cement is soo much better!
 Just kidding!! - 
  I would not put any rubberized rust preventative under a car, if rust gets attacks from around the edges, it eats behind the undercoating & causes all sorts of prob.s I would use por15, master series or nothign at all - Bob has nothing - just good to keep on checking on the vehicle at least once a year and tend to any rust you see. 
 For Junior though I felt he needed some protection  being my daily driver especially the winters were eating him up, 
 -really bad with salt, stones and dirt - as some have seen before... from a day of driving to and from work.....  
what looks like rust was dirt/stones on his nice ( then) paint work......

 Still, I would not do it again, but with the tarred areas I scrape clean, the metal is beautiful.  Tar removal will be  a royal pain when I restore it starting next summer...
M