Here are some good brands of waterproof materials in China.
1. Gulai: Guangzhou Gulai Building Materials Co., Ltd.
2. Guangdong and Hong Kong: Shanghai Guangdong and Hong Kong Building Materials Co., Ltd.
3. Thibert: Guangzhou Thibert Building Materials Co., Ltd.
4. Cai Jia: a well-known building materials manufacturer in Hunan.
5. Gaode: Gaode (Guangzhou) Building Materials Co., Ltd.
6. Xiluoka: Hunan Xiluoka Building Materials Co., Ltd.
7. Yuhong: Beijing Oriental Yuhong Waterproof Technology Co., Ltd.
8. Gu Shuibao: a well-known building materials manufacturer in Hunan.
9. Ma Bei: Italian Meibao Group
10. keshun: keshun waterproof technology co., ltd.
The above are several well-known waterproof material manufacturers in the market for your reference. Thank you.