I HAD MY CEDAR POST FENCE PAINTED BY A "PROFESSIONAL" 1 YEAR AGO. THE FENCE WAS 1 YEAR OLD AND UNTREATED. THERE WERE BLACK STREAKS ON THE FENCE THAT I PRESUMED WAS MOLD AS I INQUIRED ABOUT HAVING THE PAINTER POWERWASH THE FENCE WITH AMMONIA /H20 MIX PRIOR TO PAINTING.
HE SAID NO NEED AS HE WAS GOING TO PAINT WITH A MILDEW RESISTANT PAINT. THE MOLD IS BLEEDING THROUGH HEAVILY. I SUSPECT THE FENCE NEEDS TO BE TREATED PROPERLY AND REPAINTED.