heres the update as promised
i used conducting paste. ( ghuncha/nashit recommended me that and bought it from college road rawalpindi for 1200rs ). below is its picture

the instructions which came with the paste stated,
1) shake vigoursly for 30 seconds before use
2) use the brush or swab provided
3) let first coat dry before applying second.
4) takes 10-15min to dry upto usability
5) takes 24 hours to completly dry for maximum conduction and adhesiveness.
6) heat cure possible
7) low heat soldering possible
its very easy to use. the paste is exactly like nail polish, smells the same aswell, applying method is the same aswell. just draw conductive lines in thin layers. and your done.
below are couple of pics of my attempt.

two of defogger lines where scratched from center. i masked it with tape and applied the conductive paste in between. pictures below


after applying the paste, and letting it dry, i tested it using the same method mentioned in first post.
all worked properly, got a gradual voltage drop thru out the lines.
the paste is silver in color, most of it is hidden under the c pillar mold, i will use a black mat marker for rest of the edges.
thank u, thats all