Oof,I can't complain so far but it's getting cold,eh?The desicant filters are the ones I refered to ,I haven't used the others.For fillers anything mid priced and up is good,Dyna Plus is good+,BasecoatClearcoat,and Rage are toward the top and Dynalite is medium grade but good.There's many more out there but I haven't really followed them recently.No White Streak or Napa's Cuz if they're still around.You didn't tell what epoxy you're using but I epoxy right after stripping,then do the bodywork.If you're using HOK epoxy it really wont hurt to mud it and then epoxy it (I still wouldn't) but if you happen to be using PPG epoxy it's better to use the epoxy first and use a urethane primer surfacer over bodywork-PPG's epoxy is soft and can shrink in days down the road after applying.Which epoxy are you using?There are quirks to PPG's epoxy but I think it has the best corrosion protection so far without the added expense of a 2part wash or etch primer and the problems they can cause.I've litterally watched freshly cleaned and prepped parts rust in front of my eyes as the wash primer sucked up our humidity as it flashed off,that's one reason I rarely use it anymore down here.You either need a heated booth or the humidity needs to be low.Neither's a common occurance in our part of Florida.