To make your latex mold use "latex mold builder". Before applying I used a non drying clay to add a little support to the tail to be sanded off after and a small spout on the models hips for pouring the resin. Apply latex with Q tips making sure the first layer goes on smooth and kind of thin with no bubbles. I put five more layers on then apply gauze for strength. It is white on application and dries tanish as in photo. If no guaze 8-12 layers are needed-if using gauze 6-8 layers. You can really gob it on after the first two neat layers. I do the bottoms of the hooves first. Next (third photo above) using plaster of paris-first use plastic wrap on the model over the latex so the plaster doesn't touch it when you put it on-lay the plaster on the models belly, half way to the back, chest and underbelly and around the pour hole. Remove when dry. layer the model with plastic wrap again and also wrap your new "back up mold" of plaster so it doesn't stick to the other side when you do the same so that when dry, using an elastic, it forms a coat around the belly to help support the shape. Next set the back up mold asside and using sharp scissors or exato knife cut your seams in the latex so you can get the mold out-make sure to be as neat as possible. I do the following: upper lip, under side of neck, chest, bell, to tail in a straight line. Next do the front of the legs from hoof to meet your line on the chest and do same for hind legs. You should then be able to take your origonal out with a bit of pulling and working the latex. Using rubber cement use two or three layers to seal your seams. Make sure no holes! Using a resin such as Por-a-kast pour it in the spout and make sure to give a pinch to the ears and tap places that bubbles may form such as top of neck, knees, tail ect. Once it sets use scissors/exacto to open the seams and take your resin out. picture below of resin copy, origonal (now painted a blue roan in the back) and set up for another casting.