Automotive clear coat is not compatible with the resins in pine. A better choice is Sikkens Cetol Marine Gloss. It has a UV blocker in it. That's the finish used on the teak trim on most boats and it is the finish I used on the purpleheart bed of my truck. Available from any boat supply store or via internet at westmarine.com
J.E. Moshers Aniline Dye from Woodworkers Supply @
http://woodworker.com comes in every color imaginable to allow you to reproduce almost any color wood from pine or, if you have an artistic bent violet, blue, green, yellow, red and nigrosene (very very black).