Testing squibs and explosives for some SFX in a commercial

Today we tried five different sizes and types of so called squibs for an effect in a commercial.
Our goal was to disperse a plastic bag full of water without damaging the wall behind it too much. In the end we opted for a little bit wall damage and a nice dispersal pattern using 1g of PETN.
BTW, this was 15mm plywood ;)
See the final effect in this video: • Water melons and high ...