TQ fuel well repair Marine Tex

I know that Marine Tex is the reported best to repair the fuel wells on a Thermoquad but I found they have quick set version and was wondering if any body has used it?

http://www.amazon.com/Marine-Tex-Rapid-Set-2-Ounce/dp/B000Y8A06C/ref=pd_bxgy_sg_img_y

I get marine tex good and hot when in a hurry, cool it off and its hard as a rock