A prespray processing method includes preparing a work surface for spray coating, roughing the work surface by pressing a tool against the work surface, having a material of the work surface displaced thereon to form a depression thereinto, and keeping the material of the work surface unremoved therefrom.

 
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< Preform, hydroforming method, and hydroformed product

> Washer fluid spraying apparatus

> Variable capacity vane pump with force reducing chamber on displacement ring
~ 00557