1）External factors: The thickness of the glue is thin, and after the direct exposure to ultraviolet light will lead to faster fading time.
2) Internal causes: Poor colouring power of the colour paste, the thinner the thickness of the glue, the longer the sun exposure, the faster the fading speed.
3) Transparent glue yellowing, some groups in the molecular structure of the glue strip is oxidised, resulting in yellowing.
Solutions
The best thickness of the adhesive strip during construction is ≥6mm.
Replace the imported colour paste with good adhesion and optimise the product process formula.
Add antioxidants, stabilisers and other additives in the process production to improve the weather resistance and oxidation resistance of the product.