I've got a buck pedestal mount I did about 14 years ago, hide was commercially tanned, still looks like the day it was done, except a little dust LOL. I still use the same tannery.
I experimented with dry preserve on a half mount raccoon, and while it got a 2nd place professional in 1997 or therabouts ( eastern regional), I notice this past year it has begun to get a color fade to it. Another raccoon I mounted near the same time, I used a syntan in-shop, and I see no fade in it. Neither mount has been in sunlight.
Just an example of what is quality and what lasts. And I get the stories from hunters about a taxidermist they use to go to or tried once. They now prefer my work anyday after the other guy's has fading, cracking, or just doesn't look like a live deer/looks "off". The other guys used were cheaper in price than me, not surprising at all. LOL and last week I had 2 young guys who have used me before telling me 450.00 is cheap for a shoulder mount! Usually it is other taxidermists ( quality/award winner/etc) who say this to me.