Another option is to use the ProCast dip kit from Quickburst. (BKNO3V).
https://www.apogeerockets.com/Rocket-Motors/Motor-Starters/ProCast-Mix
Just under $55.00 from Apogee : $42.50 + $3.47 Sales Tax + $8.96 USPS Parcel Ground = $54.93
Order direct from Quickburst : $35.00 + $8.00 Ground Shipping ( No Sales Tax ) = $43.00 . . . Save almost $12.00 !
https://quickburst.net/qb/procast-order-page
Dave F.