Is the Fair Spike to Footstool Guaranteed?

[TheRealSkid]

Basically the title. I used to land it ALL the time, but now my brother (who mains cloud) manages to up b before I footstool him even when I mash X. Do I mash faster? Or is it not a guaranteed footstool? Thanks

 

[Justinian]

Fair footstool is true. However, if you spike them with the first two hits, they'll be out of hitstun and will be able to escape (they might not be able to recover anyway, but you might not either). Try to spike them on hit 3 or 4 and it should work every time if you spam jump.