|Home » Forums » Veneer Forum » Message||Login|
You are not logged in. Consider these WOODWEB Member advantages:
black spotting when flattening veneer1/24
Using the glycol/glue/water/alcohol mix recommended, I have had black spotting (mildew) appear over 12 or so hours on my veneer (with absorbent paper between the cauls). Spotting does not appear when tested in open air, so this does not appear to be an oxide/contaminant reaction. Any recommendations on how to avoid this? Is there an anti-mildew agent that could be added to the mix? Thanks!
My guess would be either old or expired glue or something in the water reacted with something in the veneer. White glue will actual grow mold on its own.
That could be. Do you think a "no-grow" agent such as for a humidifier would reduce this tendency (if it is actually mold and not a reactance? Thanks.
What species of wood? Distilled water used in the mix? I wonder about a reaction between minerals in the water and the wood. Thinking about high tannin species like white oak.
This was tried with cherry, various cuts. It spotted with the softening formula and plain water in the press. However, the one I left exposed to atmosphere (not sandwiched in the press) did not spot. It appears to be mold, although I am amazed it would develop that quickly. I am considering adding a mesh to allow better air flow. Oddly, I cannot find any reference to this problem in any veneer flattening references!
As mentioned, the mold may have been in the glue. I would suggest all fresh ingredients and distilled water for you next effort. Mold spores are everywhere, they just need the right environment and the right amount of time to grow anywhere.
Thanks, I will try new glue in fresh mixture.