In a word "No" it wont hurt, but WD40 isn't a long term lube:frown: so just lube really well with Molly Grease, and you should be ok for a few years, + depending if this is your daily driver or not (how many miles per year).
I just used to spray on "Motorcycle Chain Lube" that has molly grease in it, this will penetrate into the bush, its great stuff.
I did mine over 10 years ago and just pulled the car of the road for a complete rebuild and they were still greasy!!! And was driven about 5k per year.
Also regular spraying WD40 would probably "wash out" the grease!
The spray on Motorcycle Chain Lube works a bit like WD40, and the molly grease is carried in a solvent which allows the grease to get into the chain (bush) than the solvent evaporates leaving just the grease, its used by Moto-Crossers to keep the chains well lubed in all the dirt and mud etc