Can be used as is but its better to paint them. Made from flexible GRP fibreglass, please mind that they are flexible on twist not stretch. If you fix them with rivets please be sure to use aluminium rivets (steel ones are too strong for this job) and make sure that there is no free space left between fenders inner side and your car as it might result in cracked screw/rivet indents.The item "50mm Wide Universal Fender Flares Wheel Arch Extension Arches Trims JDM Set S3G" is in sale since Tuesday, January 26, 2016. This item is in the category "Vehicle Parts & Accessories\Car Tuning & Styling\Body & Exterior Styling\Wheel Arches". The seller is "sstuningparts" and is located in EU, Marupe. This item can be shipped worldwide.