Absolutely NO.

This 9900 engineering adhesive is strong on cracks but safe on structural surfaces. It is designed to tightly seal leaks without corroding or scratching plastics, glass, metals, granite, quartz, ceramic, or wood.

So you can fix your home and car assets confidently without fear of damaging anything in your property.

For the industrial chemical compounds to create a 100% airtight seal, they must directly bond with the target material. Dust, grease, water droplets, or old dirt particles form a barrier that will weaken the grip over time. Always clear and dry the area completely first!

Because it is optimized for heavy-duty weather resilience, it dries into a highly stubborn skin. If it touches your skin, it will not cause burns, but it is extremely difficult to wash off with standard soap alone—you will need to firmly scrub your skin with fine sand and soap to clear the residue. Always wear nylon protection while using it!

The initial chemical set requires a minimum of 3 hours completely untouched. However, the compound continues to crystallize and strengthen over a full day cycle. Always remember the professional rule: The longer you leave it to dry, the stronger it becomes.