Please recommend a Daiso hairline cover product.

Has anyone tried the Salon de Color Pang Pang Hair Cushion? I'm worried because I have a lot of gray hairs. Dyeing my hair every time is a burden, and my hair is also very damaged. Will this powder, which is similar to hair fibers, run down my face if I sweat or get caught in the rain? I'm curious if there are any other inconveniences in using it.