+xIn most applications, due to GlassCast's excellent self degassing properties, vacuum degassing is not necessary. However if you wish to do so, there is no reason why you cannot do so.
You should aim to achieve as high a level of vacuum as your pump will achieve - we tend to recommend around 29.9inhg vacuum or better should be plenty. Most epoxies do not "self collapse" during degassing so it can be hard to know exactly once full degassing is complete. So limit your degassing to a maximum of 5 minutes after full vacuum has been achieved. You may still see bubbling or a slight froth at this point but this will collapse as the pressure returns to atmospheric pressure.
Thank you very much! That was very informative!