Well, the enclosure should be properly sanded down so that splinters wouldn't be a problem. If it is a bit rough, that's fine (not as easy to clean however). The purpose of sealing an enclosure is to protect the wood from moisture, etc. and to aid in cleaning. I use epoxy to seal all my enclosures. It provides a waterproof seal (urethanes can also be used, but they just provide a degree of resistance to moisture and need to be refinished from time to time, depending on use), and is 100% safe when cured. It is used on food surfaces, pharmaceutical facilities, pools, etc. The kind I use is Epoxal 3:1 available from Niagara Protective Coatings. Your dad will likely be familiar with epoxy, as you would be using something similar to adhere the fiberglass. Polyester resin is used to do this, but it is not necessarily the best choice for reptile enclosrues. It isn't 100% safe, is fussy to work with, and isn't as resistant to water. It is also much more hazardous to work with.
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