I couldn't find the specific combo I spent quite some time researching last year so I tried ChatGPT. Within seconds it recommended the exact solution I ended up using based on my searches back then.
"What adhesive would work well for affixing a mylar sheet to foam board?"
> A good adhesive for affixing a mylar sheet to foam board would be a spray adhesive, such as 3M Super 77. This type of adhesive can provide a strong bond between the mylar and foam board, and it dries clear, so it won't be visible once the mylar is attached. You could also use a glue stick, but it may not provide as strong of a bond. It's important to use an adhesive that is compatible with both the mylar and the foam board, so be sure to read the labels carefully before making a purchase.
Interesting how the very first sentence went for a brand name. Naively I thought it would at least start with compounds, even if give a few examples of products in the end.
"What adhesive would work well for affixing a mylar sheet to foam board?"
> A good adhesive for affixing a mylar sheet to foam board would be a spray adhesive, such as 3M Super 77. This type of adhesive can provide a strong bond between the mylar and foam board, and it dries clear, so it won't be visible once the mylar is attached. You could also use a glue stick, but it may not provide as strong of a bond. It's important to use an adhesive that is compatible with both the mylar and the foam board, so be sure to read the labels carefully before making a purchase.