Humidity definately does affect it. do not keep adding icing sugar because when it dries it all cracks if it has too much sugar in it. The trick is to spray your hands with mo stick spray and work it in your hands for at least 5-7 minutes. It is like working with clay etc, you need to work it out to make it soft and pliable.
Humidity DEFINITELY plays a role in MMF. I live in northeast Texas. Today the actual temperature is 95, but with the humidity, the heat index is 108. I tried to make a rose yesterday with MMF and it just became a big pile of goo. I got so frustrated, I actually started crying. I don't know what you can do (if anything) in weather like that to make the MMF workable, but if any one knows, I would definitely be interested. I had my a/c on full blast, and it didn't even help.
I just started working with MMF myself. I did a pink "under the sea" theme with it. I live in Michigan were the humidity is usually at 70% or better here on the lakeshore.(Lake Michigan) My workroom is in my basement and I've found that all my decorating goes better with my de-humidifier running. My MMF, royal icing, etc. seems to handle MUCH better! I also run my A/C all summer long. This also helps.
Good Luck!
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