Hello again yall. So I have a good one for you this morning. I'll get right into it: I'm going to start building a fume hood today, and I'm what you would call an extremely avid DIY-er as well as a excellent "sourc-er", for lack of a better term. In other words, I can build marvelous machines and contraptions ( alot of times with hardly any money, due to connections I've made in the construction industry, and my particular role there, which alot of times puts me on a given jobsite as they're nearly finished, and throwing real good material in the dumpster to clear it out. Anyways, I've got my material, and I've got a brand new fan with a brand new motor, that was going to go on a small boiler, but was scrapped due to an ordering mistake, and subsequently, given to me. Part of my job happens to be sizing components to move determined quantities of air, so I kno the fan will work, but there's a problem here.. It's made of steel and aluminum. I have a few ideas on how to protect the motor from the fumes by building a sealed housing, allowing the fan to protrude into the ductwork. But my problem is with the fan and tge shaft. All of that, to get here.. To my question.. Is there something I can coat, or spray the fan down with to protect it? Some sort of.. Idk.. Plastic coating?? Rhino liner, varnish? Flex seal?? The reason I need yalls advice is because I'm not too knowledgeable in the area of what's safe to mix with what. And as such am unsure of tge reactivity of such protectant with the chemicals I'll be using. . So I stick to a few key processes in this gold recovery endeavor, and I only deviate from said processes after much research and advice from this forum. So basically just hcl, nitric acid, and the 2 combined. Thank yall. Happy Friday!