I would be fine with virtually any "not too highly technical" manufacturing business. I am not a chemist, or an engineer of any kind, but am an experienced businessman in my mid 40s with 18 solid years business experience. I am quite a hands-on, mechanical type of business operator and am ready, willing and able to roll up my sleeves, get dirty and learn quickly about the business I will be purchasing.
Manufacturing products and processes could include wood, metal, fibreglass, plastic, vinyl, fibre materials, glass ... almost anything that I would be able learn about with the assistance of the current owner and others currently employed by the business, and who would presumably stay with the business post sale
I prefer business to business sales and marketing, but would probably not exclude an industrial or commercial retail business. And, I'm sure there will be businesses out there that I haven't even thought of at this point, so let me just say that I am a businessman interested in good profitable business enterprise with a future.