What is a general guideline for using protective creams while handling sealants?

The correct understanding here is that protective creams can contaminate the sealant. This is particularly important in aerospace applications, where the integrity of sealants is crucial for safety and performance. Sealants often require very clean application surfaces to adhere properly, and the presence of contaminants—including certain chemicals found in protective creams—can compromise their effectiveness.

It's critical that any substances applied to the skin do not interfere with the properties of the materials being used. Therefore, ensuring that any creams used do not transfer to the sealants is an essential practice in the handling process. This understanding also aligns with the need for maintaining stringent cleanliness standards in aerospace manufacturing and repair environments, where even minor contaminants can lead to significant issues related to bonding and sealing efficacy.