julia watercolor

i was talking to julia about watercolor and masking fluid. i found an old bottle and it is really thick, so, i could not make very fine lines. i have no idea how to put he address on here. i could only put the stamp down low. it did not look right up in the corner.
the address will be fine at the bottom, but, i have no idea what to use.
suggestions?
the watery background was done with gouache and too much water. i was too lazy to get out my watercolors.