I haven't done much modeling work. I'm going to be hand sculpting a pistol for my husband's birthday cake and wasn't sure what I should use. I considered making my own fondant, buying Wilton fondant, or should I buy gumpaste? Or just add tylose powder or gumpaste to fondant? Any advise or suggestions on favorite sculpting material? I don't want something that'll dry before I get finished! Thanks in advance!