some advice
1) throw the bondo in the trash and buy some evercoat... sands/lays down WAAYY better and it's priced close
2) use a bigger spreader if you're going to put that much down that way you don't have as many ridges and overlap when you lay it down it should spread way smoother
3) before it gets hard use a body filler grater to knock down the big ridges and stuff
question: why did you use fleece for the starting of your "mold" into the side of the trunk? most of the time fleece is used to stretch from one piece to another and hold the shape
keep it up bud .. can't wait to see the truck too