Howdy all,
I thought I'd chime in on this subject since I just recently did a bit of experimenting with different 'shallow' fillers.
I have used regular White-Out straight out of the small bottle it comes in and had decent results with it. I found it easy to work with, but at the same time a little hard to avoid it cracking a bit (this was on a piece of Italeri plastic which just for the record was a bit brittle and a tad thin.
I also tried thinned Milliput and was also happy with the results. But, I felt that this type of filler would be better suited to deeper depressions and/or situations.
Lastly I tried a slow-acting CA glue mixed with a bit of talcum powder and discovered I was most happy with it's results. Reason being, the CA glue/powder mix had almost undiscernable (sp?) shrinkage, and the powder mixed in gave me a very clear picture of precisely where and how much of the stuff I had applied. Additionally, the concoction dried to a sandable consistency within just a very few minutes allowing me the ability to add more or work on another part of the overall project.
just my Farthing's worth.
hth.
Tread.