1. Inspection: The colloid is fine and uniform, without particles or layering;
2. Application: The application of the glue is smooth without dripping or sagging, and the joint is full;
3. Testing: The butterfly test shows no bubbles, and after curing, it has good elasticity and does not crack;
4. Observation: It has strong weather resistance, and does not yellow or powder off in the long term outdoors.
I recommend the shuangyuan organic silicone SY-9900 curtain wall silicone structural sealant.