Just to clarify, the Kleer Koat recommended by the previous poster is identical to the Envirotex Lite I recommend and the Glaze Coat discussed in a thread from earlier this week.
I remembered another person having troule with the Envirotex I recommended and I was able to find that post in the KS archives the other day. And you can read Wayman's recent thread where he also had trouble.
I agree that these are great products but want to stress that extreme care must be taken when mixing these. But in many ways they are the idea sealant for reptile enclosures provided the proper care is taken.