GLF-4 CREW HAD A CARGO DOOR PRESSURIZATION LEAK THAT REQUIRED A RAPID DSCNT TO 15000 FT BECAUSE THE CABIN WAS CLBING UNCTLABLY. THE CREW CONTINUED TO DEST WITH PARTIAL PRESSURIZATION. OXYGEN MASKS DROPPED. THE CAPT DID NOT RECORD THE CARGO DOOR PROB IN THE ACFT MAINT LOG. THE CAPT REPACKED THE OXYGEN MASKS IN NON COMPLIANCE WITH MAINT REGS.

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I WAS ON A FERRY FLT. AFTER TKOF; THE BAGGAGE DOOR SEAL DID NOT SEAL. THE CTL OF THE ACFT WAS GIVEN TO THE FO. I; PIC; WENT AND INVESTIGATED THE CARGO HOLD. I FOUND THE DOOR SEAL (CARGO) NOT SEALED. AS I WAS RETURNING TO THE FLT DECK; THE CABIN ALT EXCEEDED 13500 FT AND THE PAX OXYGEN MASKS DROPPED. UPON REACHING THE FLT DECK; I DONNED MY OXYGEN MASK AND DSNDED TO 15000 FT WITH PERMISSION FROM ATC. I CONTINUED TO MY DEST AT THAT ALT LEVEL. THE CABIN PRESSURE WAS NOW 8800 FT. UPON ARR AT DEST; A MECH MET THE ACFT; INSPECTED THE DOOR SEAL AND FOUND A SMALL GAP. HE APPLIED SOME RTV SEALANT. 1 HR LATER; I CLOSED THE ACFT DOORS AND DID A PRESSURE CHK. ALL WAS OK. I RE-STOWED THE PAX OXYGEN MASK AND CONTINUED WITH THE NEXT FLT. ALL WAS OK. THE SEAL INFLATED AND DID NOT LEAK. MY FAILURE; AS I LATER LEARNED; WAS THAT I DID NOT LOG THIS IN THE ACFT LOG AS A DISCREPANCY AND I WAS NOT APPROVED TO RE-STOW THE PAX OXYGEN MASK. SUPPLEMENTAL INFO FROM ACN 598133: ON CLBOUT; THE FLT ATTENDANT RPTED A NOISE FROM THE BAGGAGE COMPARTMENT. UPON CAPT'S RETURN; I INFORMED HIM THAT THE CABIN WAS STILL CLBING. AS HE TOOK THE CTLS FROM ME; THE MASKS DROPPED; AT APPROX 13000 FT CABIN ALT. WE DID NOT DECLARE AN EMER; AND CONTINUED TO DEST. LATER; THE CAPT SHOWED ME THE SMALL CUT IN THE BAGGAGE DOOR SEAL AND THE REPAIR THAT THE MECH HAD MADE BY APPLYING SOME RTV SEALANT. IT WAS ONLY LATER THAT I LEARNED THAT THERE WERE ISSUES CONCERNING THE FACT THAT THIS WAS NOT ENTERED INTO THE ACFT LOG AS A DISCREPANCY; AND THAT THE CAPT WAS NOT APPROVED TO RE-STOW THE MASKS.