This dent is in the front bumper of my wifes Prius.The bumper is rubber.What should i use to fill it in? I will be ording the paint from PaintScratch.

I may be wrong, but i think you are out of luck on filling rubber parts. fillers are not flexible. There is a flexing agent that is mixed with the paint so it wont flake off, but i don't know of any fillers.

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1959 Gravely LI, 1963 Gravely L8, 1973 Gravely C12
1982 380SL
1978 450 SEL 6.9 euro restoration at 63% and climbing
1987 300 D
2005 CDI European Delivery
2006 CDI Handed down to daughter
2007 GL CDI. Wifes

I think you can use bondo but just use a very aggressive sand paper first so the bondo has something to hold onto. You can always use fiberglass to.

Thanks for your help.