PLT OF A PIPER SENECA; PA34-200; FLEW INTO CLOUDS AFTER A VFR TKOF AND CIRCLED THE ARPT DOWNWIND WITHOUT BREAKING OUT OF THE OVCST RESULTING IN CLBING TO ON TOP AND CONTACTING APCH CTL.

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ATC ADVISED TO EXPECT VISUAL APCH TO OMN; THEN AT THE LAST MIN ISSUED VOR APCH CLRNC. HOWEVER; BY THAT TIME; I WAS TOO CLOSE TO THE ARPT AND EVEN THOUGH I ACCELERATED MY DSCNT; I WAS PAST THE ARPT AND STILL IMC. I WAS MOMENTARILY DISTR WHEN ADVISED BY ATC THAT I OVERFLEW THE ARPT. I FOLLOWED ATC INSTRUCTIONS FOR CLB; ALT AND COURSE AND WHILE BEING VECTORED FOR ANOTHER APCH; AND WHILE IN VFR CONDITIONS 'IFR ON TOP;' I CANCELED IFR AND PROCEEDED TO NEW SMYRNA ARPT FOR REFUELING. THE APCH AND LNDG WERE IN EXCELLENT VFR CONDITIONS. AFTER REFUELING; I TOOK OFF VFR INTO WHAT APPEARED TO BE A LOW HAZE BUT WAS LOW CLOUDS. AFTER INADVERTENTLY ENTERING THE LOW CLOUD BANK; I IMMEDIATELY MADE A L TURN XWIND AND THEN DOWNWIND TO LAND AT THE ARPT; BUT CONTINUED TO REMAIN IN THE CLOUDS AND COULD NOT LAND. REALIZING FROM MY PREVIOUS APCH THAT THE CLOUD TOPS WERE AT ABOUT 3000 FT MSL; I CLBED AND IMMEDIATELY CONTACTED DAB APCH AND ADVISED THEM OF MY SIT. HE ISSUED ME AN IFR CLRNC. HOWEVER; I CANCELED IFR AND PROCEEDED ON VFR ON COURSE TO PMP WHERE I LANDED. I WOULD HAVE FILED IFR NEW SMYRNA TO PMP; BUT THE SHORT REFUELING STOP; THE VFR CONDITIONS INBOUND TO NEW SMYRNA (DAB WAS IFR); NOT REALIZING THAT THE LOW CLOUD DECK WAS DRIFTING SOUTHERLY FROM OMN AND DAB TO NEW SMYRNA ARPT; AND THE DAY WAS APCHING DUSK; ALL CONTRIBUTED TO THE LATER INADVERTENT IFR INCURSION. THE APCH SIT WAS CREATED BY ATC AUTHORIZING THE OMB APCH TOO LATE; THE PLT'S DELAY IN EXECUTING THE MISSED APCH PER APCH PLATE. ATC WAS VERY COOPERATIVE THROUGHOUT THE 2 EVENTS RECITED HERE; AND I WAS NOT ADVISED TO 'CALL THE TWR.' HOWEVER; I WILL SEEK ADVICE ON THESE MATTERS.