@Bjarne ***************
nope, that's not how it works 😕
INSIDE the country all Non-Immigrant visas are sold as "no entry" <- meaning there is no re-entry permit and that's because you're already IN thailand when you buy it. You apply, wait for the review period (usually 2 weeks) go back they ink in a Non-O visa and give you a new 90 day stamp.
Then when that 90 days runs out you go apply for a yearly extension by meeting the proof of funds. ONCE you get that year extension you could buy a re-entry permit to let you exit/re-enter the country BUT that permit won't add any days to your extension just let you exit and come back with the same expiration date.
NOW OUTSIDE the country a Non-immigrant visa is sold as either a 90 day single entry <- enter the country once for 90 days and that's it OR a year-long multi-entry <- enter the country as much as you want for the year the visa is valid for and each entry gets you stamped in for 90 days at a time.