"Maseco" is not a standard dictionary word in English, so it is difficult to provide a definitive answer on its spelling. However, assuming that it is a derived term, we can make some educated guesses. Phonetically, Maseco would be spelled as /məˈsɛkoʊ/. There are no double letters, and the "e" would most likely be silent. In general, when creating new words, it is important to follow established spelling conventions to ensure ease of communication and understanding.