Hi all have a few questions here that I hope you'll be able to answer before I possibly waste expensive ultravest. I am vacuum casting a hollow object (a pipe) that has holes about 1/8" diameter at differing heights. Can I just sprue this up and fill the flask like normal and let the vacuum pump do the work to fill any trapped air with investment? Or do I need to do something special to fill it completely? It's going to be sprued from the base of the chamber so the investment will have to flow in from the bowl, carb and then down the mouthpiece. Also I'm not sure if the investment will be strong enough for it to stay put from those inlets? Do I need to nail through it?