How do I fix my grinding errors?

I thought that was part of the learning process.

 

Ive used everything and i was it the local menards one day and they had a gallon of bonbo brand filler so i grabbed one.. It worked just fine and sands easily enuff. Most backyard body men just dont use the right materials for sanding to finish the filler and they create more work for them selves..
Dave

 

Haha. Lol.