Guild Wars 2

This is sort of a dumb question, but I was wondering.. I’m an ele so we dont get a second weapon set to swap to in battle. If i put a different type of sigil on my water weapon, will it’s effect only work if im in water battles, or does it apply full time (for example if I have Sigil of Endurance on my staff, If i placed a sigil of water on my underwater weapon (30% chance to heal allies on crit), would that be a permanent effect on me as long as i have that weapon? Even if im fighting on land with my staff?

No

All on swap sigils trigger on attunement change / kit change, so they are actually better on ele/engi.

Alas many on swap sigils have a cooldown, but it’s not usually longer than 9 seconds.

Yes your underwater sigil will only affect underwater battles.

Keep in mind that any sigil with a cooldown will stop other sigils with a cooldown from activating (even if it’s a hidden cooldown).