The last post pretty much just summed it up.
Addittives just make more problems if not properly used. No offense to the place where you brought your stuff from but I have found it alot easier to go to the paint store and talk to someone who can look at what your doing.
Not sure how the truck was before you started but one coat of sealer should have been sprayed over the body work and old paint followed by the base coat white then tape it for the blue and pull the tape off and three coats of clear.
If it was my truck I would sand it completly down wih 240-320 and start over. Trying to fix what you have started you are going to waste more time and money.