Alberto,
I too would be hesitant to use anything water base on bare wood for fear of raising the grain. That's why I have used the hairspray first with good success. If you can't find a lacquer based hairspray, juts go get a can of Deft sanding sealer and use that instead. I'm doing a plane now that I used the Deft product first, then used the Polycrylic water base product right over it to apply my 3/4oz cloth. I have yet to have an issue with delamination. All that dissimilar material/ adhesion discussion is exactly that.... Discussion. I'm sure there's a chemistry lesson in here somewhere but I can tell you using the two products together won't fail you. I have used the Deft product throughout the glassing process too, but using the Polycrylic sure cuts down on the fumes and eases clean up. You won't have any problems with delamination as long as the Deft sealer is fully cured.

Hope this helps,
paul