Best type of foam for barometer

Hey guys!
So I’ve read in some posts that covering the barometer with foam will help with the readings, however I would like to know which type of foam works best, how much I need to use, and how it should be installed. I tried polyurethane foam (the kind of foam that you would find in a pelican case) but I ended up with a weird altitude offset.
I’m not an expert in foam so I would like to hear your recommendations.

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An open cell foam should be ok - something like a washing pad for dishes, if you can blow through it basically, it’s just to diffuse the air.

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