Over the years I have lost a few chunks of undercoating and would like to fill in the spots. Anyone had any luck finding a process to bend the new stuff in. I know the rattle can stuff from the parts store doesnt have enough texture

If you have small areas that broke off, here is what I did and it blended real well. You can do this on both inside the car and out side as well. This is in my trunk....

....placed a little 3M Autobody sealant to fill the void and let it tack up for about 10 minute...

then I took a worn steel brush and tapped the sealant to give it a textured look...

Here is a better example to show you the end results...

....just like before and when I was done I sprayed some 3M Undercoating...

..here is the end results. You can't even tell where the problem ever was.

Good luck!! By the way, I still own this car and the fix was done four years ago and still looks good.

I'll give that a try on the smaller ones, but the wheel wells and underneath are missing a lot.

For big stuff 3M has a product called Body Shultz (sp?) It's a rubberized undercoating and you also have to buy the gun that goes along with it. It's the closet thing that I have ever found.