Great idea, especially for a backup board. I have never done this, but I do have some points to make on it.1) Do very little sanding. You want to limit sanding of the top sheet to as little as possible to protect the structural integrity of the board. Some boards have the topsheet incorporated into the structure of the board (some capped designs) and some boards have a topsheet there for cosmetics and protective purposes. You certainly do not want to sand into the fiberglass, just enough to get a primer coat to bond really well.2) Of course use paints that are flexible and can endure extreme temperatures.3) Protect the base of the board with extreme caution. Getting paint on the base could ruin it.Let us know how it goes!
