i added gumtex to my plain MMF (no gum tragacanth) it became crumbly and has no stretch at all. i also added some gel paste color to a portion and it was squishy and crumbly at the same time. the gumtex i bought is not white and it smells like vinegar, it that normal? also since it's not white, i guess i cant use it on white fondant as it makes it look dirty. this is my first time working with MMF and gumtex, i have worked with satin ice and tylose before to make chacters. please help!!! what am i doing wrong? i just want to make some little figures made of MMF instead of a premade fondant. thank you.