So, I'm guessing you took the raster images from NOAA and converted them to PNG via a converter you found?
I'm curious what you printed these images on. An 8.5x11 wouldn't produce any usable map since the image is so large, so you would need to send to a printer which - how much does that cost relative to buying a waterproof map at a store?
I'm really just asking if you have found this to be cost effective; no dis-respect.
You can call me Joel.