You have a choice, they either leak slightly and work, or stop leaking and have masses of friction, i think stiction is the term used. You need to make the seals very tight to prevent all leakage, You also increase the risk of nicking a seal during build, which will make them leak a lot.
Your leaky build *probably* has either been built with bottom limit shafts (small outer diameter), or top limit seals (large inner diameter), if its not enough for you to need to top up, i wouldn't worry about it. Just clean the shafts when you get a chance. Or put a sock over the shock to keep the dirt out and the oil in. (stops you getting a paste of oil and dirt worked into your seals.)
(For comparison with your 40 quid a pair shocks, my £800 suspension forks on my MTB leak slowly, but between normal service intervals (12 months) its not enough to cause a problem........in fact all forks leak to a degree. I guess you service/rebuild shocks once a month at least, so no need for concern).
Leak is probably the wrong term TBH........
The sticking at full extension someone mentioned the other day, its likely to be surface tension of the oil "sucking" the piston to the bottom of the chamber, once you get the oil flowing it will go away.
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