I had a good chat with a technician today who advised me of the amount and correct fire protection paint to use on exposed metal girders in my home. He advised 5 ltr of the Themoguard theme coat w. I already have 2.5 ptrs but I cant find it on the web site to purchase the remaining 2.5ltrs. . I also then need to purchase the final colour which is RAL 7035 but no more that 2.5 ltrs Please can you help ? TG2321/3008