I am looking for ancestors named Bendelius who may have emigrated from Finland to Poland or Germany in the 1700s. Do any such records exist and can I access them?
A couple of places you could start
Do the same search for the catalog and also FamilySearch wiki, located in the search feature.
We would also suggest, if you have not already, Join one of our research groups.
You can do this my signing into FamilySearch Communities, then click on research groups, located to the right. Narrow the search by adding in the language, region and locality.
Then once you have located your locality, Eg: Poland; at the top you will see quite a few links that will help you.
Then as you scroll down you will see the words new Discussion. To the right of this there is a small drop down menu. From this menu choose ask a question.
Our research team will then give you some ideas that will help you in your search.
Also Google is a great resource as well, How to begin
Also https://www.sukuhistoria.fi/sshy/index_eng.htm This might be helpful as well
Please note: When researching there have been many records that have not survived. Many reasons include, Wars, Natural disasters or neglect.
We wish you the very best in your research endeavours.