Dear Steve,
Thank you for contacting WD-40.
WD-40 is a multi-purpose light lubricating oil and cleaner. The WD-40 will definitely displace and remove the water or moisture from the chain. The "WD" stands for water displacement. It will also act as a rust preventative on any of the metal surfaces. WD-40 will not dry out the rubber o-rings. We have found no visible effects on surfaces of rubber and o-rings. Certain types of rubber will swell under prolonged immersion in WD-40 (this refers to long soaking and not just a spray)
Thank you again for contacting WD-40.
Please feel free to contact me with any questions and concerns that you have about any of our WD-40 products.
Best regards,
Eva Zabowski
WD-40 Customer Service
Check out Smart Straw at
www.wd40.com