Sorry for a delay in answer...

>Is there any substitute for rough fresco coat
>except use of aged lime putty. Somebody mention
>hydrated dry lime type N mixing with lime and
>cement ? How is working slaked lime old just 2-3
>mounts ,used just for first coat? Is there any
>chance to save a many because aged one in this
>country is very expensive, and for larger
>project it going to take a lot of material
>(3-4coats).

Sure you can use less aged lime for undercoats.
(NOTE: get on our maillist (Only Fresco...) if you are not on it yet - soon we will offer lime putty for undercoats, we have tested it for 6 years and it sets faster and stronger,
also it is 1/2 the price of intonaco lime that we sell
at http://truefresco.com/frescoshoppe
HOWEVER this (new undercoats lime putty) is not to be used for intonaco (painting layer))

>you mean month ,less or more. And what are you
>thing if the wall has no moisture(as furring
>walls) is efflorescence shows on surface.

I did not understand this part. You want the wall to have no moisture - it will deteriorate the plaster if it had. You wet the wall before applying a new coat, otherwise you want to do everything possible to prevent moisture from staying in the wall.

>gave up with that already set gypsum plaster how
>furring strips (with metal lath)going over same
>type of furring wall.(is that going to by

You shuold be fine building the wall ontop of the existing wall. You must make sure that there is no leaks or water seepage in the "old" wall.
It is advised to offset fresco wall 1-1_1/2 inches away from the "old" wall