One more thought…I find a difference in how the sheen of poly coatings “protect” a model either painted, stained, or natural. My post above I noted semi gloss as my preferred sheen because of the type “hardness” or porosity of the coating, not because of the shiny vs. dull properties. I would also use satin. To explain my reasoning: think of painting wood with a flat sheen paint. The flat sheen is more difficult to, for example, clean with a wet cloth. The flat sheen is very porous. Now think of painting wood with a gloss sheen paint. Very easy to clean with a wet cloth…the sheen is less porous. I use semi gloss poly for the degree of “porosity“ of the protection it offers. In my experience it is the porosity of the sheen that allows for successful adhesion of glues. I am less interested in the degree of “shine.” I hope this makes sense…