Hi Thomas,
Glues can vary from person to person depending on body chemistry, lifestyle, etc. One person loves a certain glue and another thinks it's just 'o.k.' It's 'trial and error.' If you're new to glues I suggest starting with a medium strength glue such as 'Walker Liquid-Tape.' Once you get the hang of it you can move on to a stronger glue such as 'Ultra Hold' if you like. People who like to remove their unit and clean their scalp every 2 weeks don't need to use Ultra Hold as it is very strong and will hold longer than 2 weeks in most cases. Another idea is to use 'Got 2 Be Glued Spiking Glue' for a short term hold. It's got a mild adhesive in it that allows for a 3-6 hold. It's water soluble so it's an easy clean up job.
Regards,
John