Used Rust-oleum epoxy sheild coating from home depot, etched floor per instructions. Looked great for 3 months completely gone by first year. Bubbled up and pealed.
Professional gave a bid of $5,000 for 2 bays, said the secret was to grind the concrete using a grinding machine to get below the years of oil and solvents from an old floor like ours. Still waiting on funds to get professionally done.