IFR C182 DEP FROM IWI EXPRESSED CONCERN REGARDING THE APPARENT ATC CONFUSION REF THE DEP ARPT.

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I WAS DEPARTING ON A FLT FROM IWI TO CDW; AND HAD FILED AN IFR FLT PLAN. BECAUSE OF MARGINAL WX; I TELEPHONED BRUNSWICK APCH FOR MY IFR CLRNC AND RELEASE. CTLR GAVE ME A FULL RTE CLRNC; INCLUDING 'CLB AND MAINTAIN 6000 FT;' A XPONDER CODE; AND INSTRUCTED ME TO CONTACT 128.3 WHEN READY TO DEPART. THE CTLR DID NOT ASK FOR MY INTENDED DEP RWY. I TOLD THE CTLR THERE WAS NO RCO AT WISCASSET; AND SUGGESTED HE GIVE ME A VOID TIME. CTLR INSTRUCTED ME TO HOLD WHILE HE TELEPHONED PORTLAND APCH. WHILE ON HOLD; I OVERHEARD THE CONVERSATION THE CTLR WAS HAVING WITH PORTLAND; HIS READBACK TO PORTLAND INCLUDED 'MAINTAIN 3000 FT.' THE CTLR THEN GAVE ME MY RELEASE AND VOID TIME; AND TO CONTACT 125.5 (PORTLAND APCH) UPON DEP. NOTE: NORMALLY; THE DEP FREQ FOR WISCASSET IFR DEPS IS 118.15; BRUNSWICK APCH. THE CTLR DID NOT GIVE ME THE 3000 FT ALT INSTRUCTION. I ASKED THE CTLR IF MY PREVIOUS ALT CLRNC WAS STILL GOOD; AND HE CORRECTED MY ALT INSTRUCTIONS TO 'MAINTAIN 3000 FT.' THE BRUNSWICK CTLR DID NOT SEEM TO HAVE MUCH EXPERIENCE. I DEPARTED WISCASSET BEFORE THE DESIGNATED VOID TIME; AND IMMEDIATELY WAS IN IMC FLT CONDITIONS. I CONTACTED PORTLAND APCH; INDICATING '1500 FT CLBING TO 3000 FT.' THE PORTLAND CTLR ASKED FOR MY POS AND INTENTIONS (AS THOUGH I WAS A VFR PLT INTENDING TO REQUEST FLT FOLLOWING). I SAID THAT I WAS ON AN IFR RELEASE FROM WISCASSET. THE CTLR SAID 'I HAVE A DEP FOR YOUR CALL SIGN FROM LEWISTON; BUT NOT WISCASSET.' THE PORTLAND CTLR THEN GAVE ME A NEW CLRNC AND XPONDER CODE. THE FLT CONTINUED UNEVENTFULLY. I AM NOT AWARE IF ANY COLLISION HAZARD EXISTED. I WAS APPARENTLY DEPARTING INTO UNCLRED AIRSPACE IN THE VICINITY OF WISCASSET ARPT; SINCE THE PORTLAND CTLR WAS EXPECTING ME TO DEPART FROM LEWISTON. I BELIEVE THAT THE HAZARDOUS CONDITION WAS CAUSED BY 1) INEXPERIENCED CTLR AT BRUNSWICK; 2) FAILURE OF CTLR TO FOLLOW PROPER IFR CLRNC PROCS; AND 3) MY FAILURE TO RE-VERIFY THE CLRNC; HAVING SUSPECTED THAT THE CTLR MAY HAVE MADE SOME PROCEDURAL MISTAKES.