Alter your geometry DATA selection to be ST_Union(geom,
bbox_of_projection)?

Not sure I get you. I see that union would trim to a square. What would be the effective box of a given projection?

--
Gregor Mosheh / Greg Allensworth    BS, A+, Network+, Security+, Server+
System Administrator, Lead Programmer
HostGIS development & hosting services, http://www.HostGIS.com/

"Remember that no one cares if you can back up,
 only if you can restore." - AMANDA
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