AlxDroidDev:
About ferric chloride: it can give very precise results. From my experience, what determines how precise and how thin your traces can be, isn't the etching method, but the trasnfer method. Some transfer methods issue much more precise results than others. I've had good experience with toner transfer, with traces as thin as 8mil, although 99% of the time I keep them wider than 15mil just for safety.
Thank you so much sir for your answer 
What do you mean with the "transfer method" and what is a "toner transfer" ?
Thank you again for your informative reply,
best regards!
Edit: Never mind I searched for it on google. But what other transfer methods are their?