FixDoWhy
Bottom heatBake low on a preheated sheet or stoneDrives heat into the base to set it fast
Blind-bakePre-bake the crust before a wet fillingBase crisps before it can soak
SealBrush egg white, set it in the ovenA waterproof layer blocks moisture
Pan & fillingMetal/glass pan; thicken wet fillingsConducts heat; less liquid to soak in