ITEM NAME:2pcs/Set HOT Industrial Heat Resistance Cold Weld Metal Paste Repair Durabl H9F8 Description&Preview.Mainly used for iron and steel casting, sand holes and pores, and filling of casting defects such as cracks. It can be used to repair fuel tanks, plumbing, concrete breaks, and a whole lot more. Easy And Fast Drying Application:The preparation and application are simple and easy.