How do you tell the difference between a Nitro and Fullerplast finish on early 90's Gibson acoustics?

[jackcooper]

How do you tell the difference between a Nitro and Fullerplast finish on early 90's Gibson acoustics?

[Hogeye]

How do you tell the difference between a Nitro and Fullerplast finish on early 90's Gibson acoustics?

It's pretty obvious. The Fullerplast has a orange peel look. Just look at the finish from a side view not straight on. You will see the dimpled look. The Fullerplast never gets a high gloss shine to it. If it's early 1990 it's Fullerplast if it's later 1990 early 1991 it's nitro. They switched to Nitro in the later part of 1990.