Protecting the Chris Cornell and other murals

I’m a mural artist and looking for help to raise money for a sealant to protect the Chris Cornell mural that’s on the side of Easystreet Records in west Seattle. As you may or may not have heard about a month or so ago that mural (which I did for Easystreet) and the Mother Lovebone mural (adjacent) and a light box was vandalized. My daughter and I went back to fix it. Cornell and other iconic bands are a vital part of Seattle and should be kept intact. By getting this sealant to put on top will secure it from future vandalism. The cost is $200.00 per gallon and I’m looking to have more than what is needed to cover other iconic murals in Seattle.