Dear Khun Nigel. First of all, I would like to thank you for your order and your review. As your review, please allow me to explain more about the product. This gold enamel from TOA provides strong surface adhesion and protection against sunlight and UV. Also, it is great for various applications such as equipment cleaning, paint dissolving, woodcraft, and more. It has product usage that - For application on a clean surface. - Dilute with 30% - 50% of No.21 thinner. Apply 2 – 3 coats. However, please allow me to provide a little information about thinner number 21. Thinner number 21 is used as a solvent to reduce viscosity, flexibility, or stickiness in painting or general industry, it can also be used in a variety of jobs according to the ingredients and ratio of thinner, such as stain wiping, equipment cleaning, paint mixing, cosmetics industry, woodworking, construction, and various technical work. In addition, there are some usage suggestions for this product. Detailed information should be studied before use to determine the correct mixing ratio and use it correctly. The mixing ratio should be selected and a diluent suitable for the type of work should be used to improve usage efficiency. However, I would like to ask for more of your information by coordinating with the related department to directly contact you. If you would like the specialist to directly provide you, you can inform the staff who contact you. Thank you. Admin