You’re actually better off using wash in than spray on, whilst yes, this reduces the ‘wicking’ properties of the material, more moisture is kept in the vapour state and passes outside of the jacket, also, once a material ‘wets out’ i.e. becomes sodden from external water or wicked sweat, it will no longer breath effectively.
Give everything a wash with soap flakes first with a decent rinse cycle as normal washing stuff will mask water repellency, then wash again with proofing stuff of your choice (Nikwax, Graingers, etc.). Tumble dry on hot is good t re-activate Graingers or the original coating.