I used to make large climbing holds with fiberglass and can certainly vouch if you are doing large areas then go to a fiberglassers shop or online to get a far better deal.
Used to get 4 litres of resin at a time and either chop, mat or sail cloth for filling plus some colouring for a pretty good price.
Humidity is a prick on the curing times if you haven't found that out already.
Sounds like a fun project.
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