I had to strip a too dark finish off a fiberglass door using a gentle stripper, cleaning with lacquer thinner, sanded lightly with 220 paper and restaining with artist oils for a richer finish. The inside held up beautiful but the exterior peeled badly after 2 years, one door is under a covered roof and only gets sun in the early morning. I won’t be able to stain it to match interior using a gel stain. Was it the artist oils?