hey im going to be touching up all the little scratches my teg has built up over the years and i was wondering if anyone had any tips to help me make this perfect. i know to do it in the sun and clean them with rubbing alcohol... anything else would be helpful if you could help me have this turn out the best thanks

 

http://www.langka.com/

I never used this myself but my uncle has and you can't tell where the chip was.