I have found that the timing of the removal is crucial, at least with
dextrose. Too early and the propellant slumps a bit, of course, but too
late, and they're a bear to remove. I use vegetable oil applied with
fingers, then gently wiped off with paper towel; leaves just the right
amount. Mandrels are galvanized (bright) bolts with a long unthreaded
section (threads are used with nuts/washers for compression as the
propellant cools).
--Steve
On 10/04/2018 07:56 PM, Ray Rocket (Redacted sender ar0cketman for
DMARC) wrote:
Not sure why, but the last few attempts at casting have resulted in stuck
mandrels. I've never had this problem before. I'm using electropolished
stainless steel tubing for a mandrel, sprayed with Pam cooking spray. This has
worked just fine in the past.
What are you guys using for mandrels and release agents?
