help on Hasagawa Corolla WRC 99

guys, I am doing a primer job on the corolla, and the rear bumper does not have a smooth surface, it is so rough , and the panel line is not clean (deep and straight). I tried to sand using 400/600 and 1000, it got a bit smoother, but still very rough. I really do not know how to make it better, please help.

the bad thing is being circled around

http://files.automotiveforums.com/uploads/257130corolla.jpg

You can try to fill it our with Tamiya Body Putty - let that dry and then wet sand everything with 400 over 600 to 1000 and you should be fine ;)

I had tge same problem with mine... btw this is the only problem with this kit.. it's still the best model I made so far...

Try putty, but personally I didn't fill it

If you have very small files use them.
On the bumper, use a small round file that fits nicly into the groove and carefully sand and shape the bumper.......do the same for the bottom smaller groove by using the edge of a really small file

ok thanks, I think I will try to put putty all over the bumper and then sand it.