I use Bondo brand primer, available in grey, black, and dark red.  It is as good as Duplicolor in my opinion and less than half the cost, plus I can buy it at the local Ace Hardware.  I'm paying about $4.99 a can.</p>

If I need something with better filling capability than the spay primer I use Bondo brand glazing putty mixed with Acetone.  Makes a superb filler which can be painted on with a brush and is very easy to sand. </p>

My absolute favorite primer is Pactra Prep but it is getting very hard to find at the local hobby shops these days and may be out of production completely.</p>

My .02 cents,</p>

Chad Veich </p>