Used great stuff (GS) - foam in a can void & crack filler fomula (cheapest). [ I previously used up all my GG but never liked it - would foam well in one spot and do bupkis an inch over so I decided it was too hard to get it to foam evenly unlike GS]. GS can push the center out if you put too much there but it's easier to control for that than GG. I use rowerwet's technique of squirting the GS onto a palette and massage it into the consistency of peanut butter and then use a Bondo thingee to apply it. Basically, I now use GS for everything that TB II and Gripper is not any good for.
I use 'the mix' on any wood that could possibly be exposed to water. These two particular supports are in the middle of the back side (inside) of the galley doors under canvas, TB II & paint, so no mix on em. If they get wet, it's because my foamie got swept away in a flood and the doors got torn off
I also fill all cracks (edges between wood pieces, wood and foam, etc) with caulk so water can't get in easily.
Gripper - tight join, panel to panel, panel to metal -- sands harder than foam (EPS Styrofoam)
Great Stuff - lots of voids, loose join, edge to panel, wood to foam, foam to foam, fill big holes --- sands easily, about same a foam in density
TB II - canvas to foam, wood to wood, tight join
GG - don't use it anymore even tho it works well. -- sands harder than foam