In article , marson wrote:

Hopefully it's premixed mud. You can slather a thick coat on it, wait
a bit for the coat underneath to soften up, and scrape the whole mess
off and start over. If it's setting type you're screwed.

Sandable setting-type mud (e.g. EasySand) can be removed with water, too.

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Regards,
Doug Miller (alphageek at milmac dot com)

It's time to throw all their damned tea in the harbor again.