OP here. Thanks for all replies, Ive been off line for a bit with a family health issue. All good now !
I have subsequently been told that Timbermate Natural (the unstained variety) is fine as a grain filler before applying any type of stain and clearcoat.
There's an online Video by Timbermate showing how you can mix all stain types into this product starting with ground coffee (the drinking type !) , and continue to change its colour by adding water, spirit and solvent based stains. I telephoned Timbermate and their tech man says it can be finished with any type of clear, including solvent based lacquers.
I mentioned in my OP that Id been told that staining the timber first can result in uneven absorption, and a blotchy finish. To rectify , I suppose that means sanding it back to find raw wood again, which sounds scary on a ply guitar body.
So, are there any downsides to applying Timbermate as a grain filler and staining its surface ?
Thankyou,
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