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@Scilly.Suffolk
Unless the spreader is static (clamped in vice for example), you can't be certain that each stay will move the same amount.
Quite likely you will end up with the rear triangle skewed to one side.
How did you arrive at 145mm? Agreed, you will need to spread the stays beyond 130mm, as they will spring back somewhat; but going straight from 120mm to 145mm, you risk spreading them too far and you will have to bend them back.
Bending steel back and forth is a good way to weaken it. Better to do it gradually: that way you will get an idea of how far they will spring back and therefore how far you will ultimately need to spread them.
To be honest, I'm don't know if it is even a good idea to set the stays all the way to 130mm: I don't bother setting my 126mm frames, just pulling them apart to get the wheel in and out.