I don't know where you are from but you are working WAY to hard at stripping the paint. I'm from the US and I use this: Spray a nice coat on, grab a cup of coffee. tea, saki whatever and the paint gives up. This spray(found at auto paint stores) is made to remove aircraft epoxy paint. Spray it and let it bubble up then wipe with paper towel to bare metal. No tools needed except a face mask/respirator when spraying. john /edit Oh and rubber gloves when wiping off the paint.