A collector sent me a photo of a painting he purchased from me that had huge ripples and sagging. It was a commercial linen canvas on stretcher bars. I will fix it for him and intend to glue it on a hard panel; what is the best adhesive to use to adhere to a composite material panel?
What you are talking about is a conservation question and we generally have a policy of not giving conservation treatment advise. There are just way too many variables that could result in a painting being destroyed rather than restored. We always recommend that the owner consult with a painting conservator.
However, this is a work that you created, and it is your responsibility to weigh the possible damage/destruction of your work with the economy of doing it yourself. Before delving into a plethora of possible options based on variables that are not included in you post, you should start by reading through our “Rigid Supports” downloadable PDF in our Resources Section.
https://www.artcons.udel.edu/mitra/resources
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