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Motor lifter the rocket off the pad but near the end of the burn, burned through the casing. On 10/24/2020 we had a 50% failure rate where 3 of 6 motors experienced this exact failure. Contacted Robert Dehate and describe the failure. He instructed us to apply a small amount of epoxy to the forward surface of the top grain to inhibit the burn. No further failures after this modification was done