I am not sure what you mean by a "secondary" stall.
The problems usually fall into the following boxes -
(a) the normal 1g stall as in certification data in the AFM
(b) accelerated (greater than 1g) stall when the stall speed increases due to the increased load factor. This is relevant to stalls in turning flight and during ham-fisted recoveries from any stall - this latter may be what you are thinking of ?
(c) a rather different phenomenon at very high pitch rates where the initial separation re-attaches due to a vortex field and the wing continues to generate significant lift forces at angles considerably higher than the "normal" stalling angle. This is rarely relevant to fixed wing operations due to the inability to generate the required pitch rates ... but may be a consideration in some rotary wing situations.