Foam Isn’t Practical Either

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The 1/2″ foam board isn’t practical either since it is required to be covered and finished and painted by at least 1/2″ drywall as an ignition barrier….and requires relocating electric devices like outlets and switches flush to the surface of the newly finished wall….and recutting and reinstalling all moldings.

Compare all that work and cost to get an R-4 with foam and you can see where the thermal paint can provide a nice alternate…and cheaper…niche.
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But you can still often get better results simply sealing the thermal envelope from air infiltration and exfiltration using caulks, weather seals, and spray foams like “Great Stuff”….all for a fraction of the cost of foam or thermal paint.