Has anyone infused using the pink/blue house insulation foam? Does it deform at all under vacuum? Edge rounding? I have this wicked idea for a kegorator mod, and I have ALL the tools at hand for a carbon fiber one 
I was thinking about prepreg and honeycomb, but it might not have good R-value compared to foam, unless I can achieve constant vacuum in the cells, post processing(
I often used the foam in infusion, it works great. I sand the both faces for a better connection to the laminate. And i drill 2mm holes in it with a micro grinder all 25mm/1inch to allow the resin to impregnate the first layer.
Edges can become a little bit round, but I prefer to shaft the edges in a angle between 45 and 60 degrees.
The laminate is more flexible than with a Airex foam, but much lighter. Thats why I often use it for covers.
Blue foam should not deform under vac. Tho you may loose and sharp corners as they may form a small radius due to the vacuum pressure. Just remember that you can nlt use polyester resin with this foam as the styrene melts it, as does acetone. I have only used this foam with epoxy resin.
Yes, only epoxy! Are not the colours of the foam an indicator for the producer?
I thought color was density? I remember using it for other things before, and there is a plastic film on it? I’m sure it’s something like PP/PE, so I will try to rip it off.
The color represents the brand. All of Dows extruded polystyrene foam is blue, Owens Corning extruded polystyrene is Pink, and Diversifoam is yellow.
Dow has Bluecor (15 psi), Square Edge (25 psi), Highload 40, 60, and I think 100 (the number designates the compression strength). There are other variations as well. The high load foams can be difficult to get unless you want to buy a full bunk of the stuff.
Owens Corning has Formular 150 (15 psi), Formular 250 (25 psi), and some others that I can’t remeber
Diversifoam has 15 psi to 100 psi extruded insulation foams as well.
The higher the compression strength the higher the density. The higher density the greater elastic modulus (and weight increase). The higher the elastic modulus the stiffer, and usually the stronger, the sandwich will be.
Adam
I rather have a higher R-value than load rating. It’s just to hold up a small thermoelectric fridge I bought, which is too short for my kegs 
The density of XPS foam will not change the R-value. The R-value goes up with foam thickness.