kurust used to be a very good product - ive not used it for a number of years - but it would react with surface rust
Think you then need to paint over it with something else
In regards to the subframes rotting thorugh - yes they are rotting all the way through, so much has been the demand in the last few months that I have actually run out of them on the shelf and they are having to be removed on order- the years of stockpiling them has actually paid off, same went for the shelves of petrol tanks and filler pipes that I had
The main area they are going is - the two arms at the top of the subframe that go forward and bolt on to the body and also the drivers side just in front of the camber bolt - which is going to be a hard area to clean and treat with it on the car