Re: ? on hide glue soaking through veneer
Sgian Dubh
>Matt, there's nothing you can do to prevent most glues oozing through the pores of single sheets of veneer as they are applied short of using a manufactured two ply type, e.g., with a paper backing-- and the manufacurers glue often oozes through too. Impact glue doesn't generally show through, but impact glue isn't a serious contender for single ply veneer.
This characteristic of deviating grain at the surface (which gives the interesting figure in the first place) is also the cause of blotchiness during staining, dying, and even polishing and is commonly noted in cherry, hard and soft maples, European sycamore, etc..
The phenomenom is exactly as you describe, the glue passes along the short open vessels showing itself on the top surface, and certain types of figure as you discovered are prone to it.
Coarse pored or open grained woods are particularly likely to exhibit the trait, e.g., white oaks, walnut, and mahogany.
Road oaks have few, or no tyloses at all, to block the open pores so glue always seeps through to the top surface.
The usual technique is to let the glue dry and then go over the whole surface with a glue wash to fill all the grain or choke the pores followed by normal surface preparation. A glue wash is glue diluted with about 15- 20% glue and the rest water. Slainte.