Just a small update. Today I have made a sort of an "A&B test" for analyzing the bubbles into my pieces. I have used Plasticast in one flask and in other "normal" investment. I haven't placed any wax or plastic tree. Just plain investment in both flasks.
In both tests I have made the following:
1) I used an adecuate mixing bowl (I used the same bowl, but with less amount of investment).
2) Pour powder into water
3) I mixed for 3 minutes with a mixer. 1 minute at low speed, 2 minutes at high speed.
4) I placed uncer vacuum the mixing bowl for 60 seconds.
5) I poured into the flask, then vacuum again for 60 seconds,
I am not sure about the results, since nothing was casted, I just wanted to check in detail the investment process. Can you give me your comments? I am not sure, but I am becoming to think that my vacuum is too old that it is not working properly anymore.
First image is the flask with Plasticast. You can see bubbles arising in this upper side.
Second image is the flask with normal investment. You won't see bubbles.
Are these bubbles normal? It is important to mention that in the back side, the flask with Plasticast is smoother than the one with the normal investment... (I will post some other pictures below). At the end, I do not care if bubbles are only in the upper side, but I am not sure if these bubbles are also in the inside of the flask.