Let's say you built two identical bows same design same stack except one has veneers so two more lams. The one with veneers will have more springboks out of the form. So how much more poundage will it have. Just did it and about 4 lbs different??

I have some interest in this.  I dont have enough bows under my belt to see what happened, but i laid up 2 bows one was meant to be 40 and the other 45.  When i glued up i was using bocote veneer in the 40lb stack and tineo veneer in the 45.  I had to swap which bow was going to end up being the 40lber because the tineo came in at 44 ish, veneer were similar thickness near .020 and the stacks were correctly glued up for the proper poundage.  So now i have a 40lb bocote finished at 45 and the tineo i took down until it hit 40.  I must have done something else because i cant see a bocote veneer at .020 being that much stiffer than a tineo veneer.

Good timing on this tread...I was just going to ask some questions about veneer.

I've never made a bow with veneers, but assume it's just like adding an outermost layer on the back.

If I had a bow with a .200" stack and added a .020" veneer, would it be the same as a bow with a .220" stack of the same design?

It sounds like the .020" veneer added 4 lbs in your example. If the lams were just .020" thicker with glass on the outside, would you expect the same increase?

Do I need to do rough up the glass on the veneer side for better adhesion?

Lastly, can I add veneers to a completed bow? If for instance I wanted to make the bow look nicer and increase the poundage a bit. I'd have to redo the tips I suppose, but is there anything else I need to consider?

I appreciate the willingness of the regulars in this forum to share knowledge!