If you want to bend Peco SM32 to such a tight radius the best way is to slide the rails out of the track bend then using a rail bender if possible then sliding them back in the track. This takes the stress out of the curved track. It way also help to put a brass screw in by the rail joints and solder the rails to the brass screws this is to stop a kink forming if the rail ends try to straighten out.
Don
Small layout project
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