Crack Resin

[RCRNR]

Is magnibond strong enough to warranty longer cracks or should one be using a thicker resin for crack repairs. I am losing out at times 4 customers per day because they have cracks over 6 inches. I am not sure if I want to re start doing crack repairs or not. Also has anyone out here used that dual head crack repair bridge I see online out of Colorado just curious if it works as well as it seems to on the videos?