You are definitely not just clumsy, chemical spills in workshops happen to everyone at some point and the ones who are prepared are just the ones who look calm afterwards. The heat point you made about containers expanding in summer is seriously underappreciated, I had a drum of degreaser develop a slow leak purely from pressure buildup during a particularly brutal August and it went unnoticed for hours. After that I got proper spill kits and also put drip trays under anything liquid in my storage area so at least if something seeps it is contained before it hits the floor. Crateco actually supplies both spill kits and drip trays and they are based right in Ajman Industrial Area so sourcing locally is easy. For a detailing business your storage area idea is smart, one kit per zone where chemicals live is basically the minimum sensible setup.