I decided to test out the effects that different preservatives would have on the same fossil. The results were surprising.
Fossils used are a Pliocene Horse Teeth from Bolivia, and a Sea Biscuit from Taiwan.
I used Paleobond, Mod Podge and a brandless handicraft varnish.
In my opinion, the handicraft varnish had the smallest impact on the final appearance of the fossil, followed by mod podge, followed by paleobond.
It should be noted however that mod podge would make the fossil slightly sticky, and this test is not indicative of the amount of protection the preservative would have on the fossil, only the final result of their appearance.