Just let it bench set for at least 1 hour 2 or 3 is even better.
Place the can in the kiln room temp. turn kiln up to burn out temp of 1450 Deg F. No ramp just let it go straight to high temp.
Hold for 3 hours minimum, ramp kiln down 200 deg per hour or just reduce the temp slowly to cast temp.
I still use my shop Vacuum to suck out any residuals left or you can use your compressor air but Vacuum is better.
And cast it.
I'm so far behind I think I'm First !!