AN ACR MD80 FLC SLID OFF THE END OF RWY 1 AT MSY DURING A LNDG ROLLOUT IN A RAIN STORM. THE NOSE GEAR LEFT THE HARD SURFACE AND THERE WAS NO DAMAGE TO THE ACFT OR INJURIES TO THE PAX. THE FLC RPTS THE PAINT AT THE END OF THE RWY FILLED THE GROOVES AND THAT ALONG WITH THE NORMAL RUBBER DEPOSITS AND GREASE AND FUEL DROPPINGS CREATED A VERY SLICK SURFACE.

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AFTER A NORMAL APCH AND LNDG TO RWY 1 MSY AND SUBSEQUENT ROLLOUT TO THE END FOR A TURNOFF TO THE L AT TXWY S; APPROX 500-800 FT FROM THE END OF THE RWY AND WHILE ON CTRLINE A NOTICEABLE DECREASE IN BRAKING EFFECTIVENESS WAS OBSERVED. IT APPEARED THE ACFT WAS 'SLIDING.' THE CAPT (WHO WAS NOW TAXIING THE ACFT AFTER I XFERRED THE CTLS AT THE REQUIRED '80 KTS' CALL) BEGAN THE L TURN TO TXWY S; AGAIN BRAKE EFFECTIVENESS WAS LOST AND THE ACFT STARTED TO 'SLIDE' FORWARD. THIS OCCURRED EVEN WHEN MAX BRAKING AND L STEERING WAS APPLIED. THE NOSEWHEEL BEGAN TO DEPART THE PAVEMENT AND ENG REVERSE WAS SELECTED TO NO AVAIL. THE ACFT STOPPED APPROX 25-50 FT INTO THE GRASS; WITH THE MAIN LNDG GEAR REMAINING ON THE PAVEMENT. I CONTRIBUTE THE LOSS OF BRAKING TO THE FACT THAT THE RWYS HAD NOT RECEIVED RAIN IN OVER 3 WKS AND WERE GREASY AND OILY. ALSO; THE PAINT ON THE RWYS WAS VERY SLICK (THIS IS FROM PHYSICALLY WALKING ON THE RWY) AND THE PAINT WAS SO THICK THAT IT FILLED THE GROOVES IN THE ASPHALT. SUPPLEMENTAL INFO FROM ACN 380927: THERE WERE NO INJURIES TO PAX OR CREW. AND ACFT WAS NOT DAMAGED AND RETURNED TO SVC LATER THAT NIGHT AFTER BEING CHKED. AFTER ALL PAX AND CREW WERE DEPLANED; I WALKED BACK TO THE END OF RWY 19 (ROLLOUT END OF RWY 1) AND OBSERVED OUR SKID MARKS ON PAINTED MARKINGS ON RWY. PAINT WAS SO SLICK THAT I SLID WHEN I TRIED TO RUN AND STOP WITH MY SHOES. WE COULD SEE PAINT MARKS THAT THE MAIN LNDG GEAR PICKED UP WHILE TRYING TO STOP. I BELIEVE THE ARPT AUTH SHOULD MAKE SURE THAT WHEN REPAINTING THEY DO NOT COVER OVER GROOVES IN RWY. ALSO MORE ABRASIVE MATERIAL SHOULD BE APPLIED WITH RWY PAINT SO AS TO HELP DECELERATION NOT CAUSE ACFT TO SLIDE WHEN WET.