... -rust, weather-ability, insulating, durable (30years), Locking option. Anti-abrasion:fibreglass content above 28%,when demage,no holistic hole,avoid sudden ... , smooth, good elastic curve, no distort, easy to open. the cover should not be sprayed on surface but the color must ... Ability:no steel, the load bearing capacity of the whole cover will be up to 25-60 Ton based on size ...