Seals will leak for a reason
What condition are the fork stanchions - any damage, scores or pitting? If there is the seals will always leak. You cannot fit new seals to bad forks and expect them to work.
Are you using double sided or single sided seals. Single sided have to be the correct way round or they do not work.
Seals are also delicate items that need fitting correctly. Have seen many banged in with hammers and screwdrivers which damages them and makes them useless.
The people fitting them normally say the seals were poor quality and think they have done nowt wrong.
