JB Weld is an epoxy, not a filler. It will always show a different texture from metal. Use JB Weld for repairs or to rebuild "hidden" rust areas not in direct view (around the windows, under the headlights, internally, etc.).

POR15 makes a pretty good body material which is extremely durable, easy to sand and it's water-based. It's a bit pricey to be using as body filler for dents. Works great for restoring crushed corners or around the tail lights.

Use a recommended body filler for large areas in order to achieve the best match.