Chris:

Since the Sanatna 21 is a 'trailer-sailor', I assume you're intending
to paint below the waterline (since the topsides could easily be
painted with the boat on its trailer)?

1700 lbs is a lot of weight to hang on a few lifting hooks.

You're best bet would be jack-stands. They will be in the way, and
you'll have to work around them, but you won't have to worry about
deforming the hull...

see: http://www.hostarmarine.com/stands/stand-sb.htm

for ideas.

Mike Worrall
Los Angeles