"似胶般固着于" can be translated into English as "be firmly adhered to like glue" or "cling tenaciously to as if glued".
Here are some example sentences for context:
The two materials are firmly adhered to like glue, making them difficult to separate.
（这两种材料似胶般固着在一起，很难分开。）
The attachment between them clings tenaciously as if glued, showing a strong bond.
（它们之间的附着似胶般固着，显示出很强的结合力。）