can this be used on iron?

Thank you for your email. It could be applied to iron, but the iron would need to be free of contaminants and rust. I'm not sure there is a purpose to priming the iron since this is a primer to be used under a self leveling underlayment or bonded flooring. Depending on what the purpose it, it may not be appropriate. For further information you could call our hotline at 800-832-9023.