I'm new to tig welding and I have been doing a lot of reading. Its been stressed the importance in having a clean metal join to weld that is free of rust, oil and dirt. My welding table sits outside (its under a canopy) and I was thinking of lightly oiling down the top with WD40 or peanut oil to protect it from rust, but I'm concerned the effect this might have when I'm doing tig. Would oiling down the table top be an issue?