我发现玻璃胶已经干了，但我担心它还会释放甲醛。据了解，玻璃胶在固化过程中会放出刺激性气体，而且即使干透，它也可能持续释放甲醛，因为这些有害物质需要一段较长的时间才能完全散发出去。

关于玻璃胶的凝固时间，中性类型通常在2小时内表面干燥，而酸性类型则是30分钟左右。但是，这只是表面的干燥时间，而完整地干透需要更长的时间。例如，中性型需48小时，而酸性型需24小时。

如果你想要进行修补工作，那么必须在玻璃胶表面乾之前完成。这取决于不同的特征和种类，比如酸性或中性的透明或者杂色型，一般来说，在5到10分钟或30分钟内就可以了。如果使用分色纸覆盖某个区域，你必须在外皮形成之前取走。

Glass glue's curing time is also affected by the thickness of the adhesive layer. For example, a 12mm thick acid-based glass glue may take 3 to 4 days to fully cure, but within 24 hours, the outer layer will have already hardened. When bonding glass or metal surfaces, it typically takes about 72 hours at room temperature for the adhesive to develop an adhesion strength of around 20 pounds per inch.

If you're working with glass glue in a confined space where there's little air circulation, then the curing time can be significantly longer and even indefinite. Conversely, raising the temperature can cause softening of the adhesive.

Before using any bonded equipment after application of glass glue - regardless of whether it's in an enclosed environment or not - it is essential to thoroughly inspect its adhesion quality.

Lastly, note that acidic-based glues release a vinegar-like smell during their curing process which disappears once they are fully cured and no longer produce any odors afterward.