I only use Neatsfoot Oil for about 10 real thin coats (rub of with cloth very thin!) Rub off after about 30sec. Then I use a Leather Balsam. Again about 5 coats, But I let it sit and soak in each layer and buff in between each layer. Then one last heavy balsam coat and hit with a hair dryer and melt in the remaining.
Then it is up to the customer if they are going to take care of it themselves or not. I always give them a can of what I am using and some advise to use it at least once a week during rain season.
And tell them it is just like their boots/Jacket /Chaps if they don't grease and oil them regularly they will be wet and the life span will not be so long and the leather will be stiff instead of nice and soft. Guys and Gals from the Military tend to listen more since their boots are so important to be kept shined and waterproofed
But when it leaves my shop it is water resistant 100%....It is leather and will NEVER be fully waterproof. After a decent hard rain it will be wet and so will their butt if it doesn't have time to dry. But if they are crying about a wet butt they 1. Should not call themselves a biker!!! 2. You should have charged them Double!
The more they ride and the more it is in the elements the more compression the leather gets and the top layers will eventually get well seasoned and not need so much attention but when it is fresh out of the shop in the first 6 months it needs a lot of attention!
If they have a lot of Chrome and keep their bike clean then it is just one more thing for them to clean and polish. Most likely they will do it themselves.
I tend to stay away from Lacs!
You live in the US and should try some Montana Pitch Blend, It is one of my favorites! Gives the Tan leather an amazing tone and protects very, very well. They have a full leather care line from soaps, oils,balsams. It is made from pine resin so it is a real good natural product.
GOOD LUCK!
http://www.mtpitchblend.com/
and here is the one i use right now
http://www.carrdaymartin.co.uk/products.html?cid=MQ==