I,d guess a motorbike frame should be around the £70 mark
For £55 they dipped my mountain bike frame which removes everything, shot blasted it and smoothed out any discrepancies, powdercoated it then lacquered it.
I use Revill Industrial Finishers on Exeter Airport for all my powder coating, shotblasting etc. Excellent service and if you have a specific requirement than can sort it out for you. Have tried most of the others round here and they are the best by far
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Riding with enthusiasm upon the ragged precipice of disaster