I am going to use MonsterMaker's foam latex to cast characters this time. I used GM's before. The quality is good but the smell of ammonium (or some other chemicals) made my throat painfull each time. I think MM's has the smiliar smell when working and baking on it. I think a respirator may work. I checked in hardware store and found they all for welding or painting purpose. Can somebody make a suggestion of a respirator?