Why body filler or "Bondo" and resin won't stick to truck hood is addressed in this video. Need to get "SMC" compatible resins and fillers from your auto body supply or Amazon https://www.amazon.com/U-Pol-Products-0777-Reinforced-Filler/dp/B005920HSE/ref=sr_1_1_sspa?ie=UTF8&qid=1537586146&sr=8-1-spons&keywords=smc+filter&psc=1 YouTube search https://www.youtube.com/results?search_query=smc+filler