If you can't smell or taste anything and the pH of the water doesn't change overnight, then it is safe for fish. If it holds water for a day, odds are it will hold for years (watch carefully for leaks in the first week, though). You were right to reseal it. An empty tank thats been in a garage for years is far more likely to fail catastrophically than a tank that has continuously held water. Be sure to level the stand and consider putting a piece of styrofoam under the tank. Most every spilt seam I've heard of either had the wrong sealant or was on a tank badly out of level.
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