Hello I was hoping to get some advice I have had some welding done on my car I asked for the work to be done to last but iv ended up with just a patch welded over the top of a hole I did treat the metal my self before the work with some Bilt Hamber Hydrate 80 I will put some photos up of before the work and I will get some photos of the work after it was done later anyway all that was done was he ground back some of the rust and just welded a patch over the top, what I wanted to be done was the bad metal cut out and new put in any way my question is how long is this work likely to last as I wanted to keep the car long term I have put some more Bilt Hamber Hydrate 80 over the patch I am also going to use some tiger seal over the weld joints and then underseal over the whole area but I am hoping this patch will last at least 12 months what are the chances of this?