Dave, 9 times out of 10 we'd end up re-sealing, because, mainly, the customer just wants it to look different, so we wouldn't be trying to save the existing sealer, so for that reason, I'm out.
Tadgh, nice to see you've accepted the challenge, well done, but surely you could run us through your method without a mention (if your method includes micro-fibre mops, go for it, you've got an excuse.)