Sealing stained pine

[xrapidx]

I know I asked this in another thread - but my search skills are failing me.

I've got a big piece of pine I want to use as a desk, staining it a dark colour - what would be the best "sealer" to handle moderate to heavy use?

 

[Dingbat]

 

[JonnyP]

 

[xrapidx]

 

[JonnyP]