Yeah I've heard some nightmare stories about SPL now. I've decided to still dip it, but to use a different firm. Company called pro-strip in Nottingham. They do it all in one go and at their own plant, dip, neutralise and then zinc prime via electro-chemical-bonding.
Not seen a bad word said about Pro-Strip, unlike SPL and where SPL dip it, chuck it back at you to repair it, then dip it again and then send it elsewhere for E-Coating, Pro-Strip do it all in one go, in house and at every stage they use anti-corrosion chemicals to ensure that once it's zinc coated, there is absolutely no chance of rust coming through in the immediate future.
It's nearly ready now too, got the sideskirt and front wing to get off tomorrow, then the engine to pull out, loom to pull out and subframes to remove, a couple of solid days working down the unit and it'll be ready to go for it's swim. lol