by StevieB » 08 Sep 2018, 07:34
I have done a bit of veneering but am by no means an expert. The key thing is that your background needs to be flat and free from blemishes - OSB would not fall into this category. There is a reason most veneered boards are either MDF or plywood.
You want your veneer stuck all over your background, which is why air pressure (vacuum bags) or large presses are often used - they apply even pressure across the entire surface. This prevents air bubbles in your veneer leading to raised areas (think bad wallpapering). Even if you got veneer to stick to OSB so it appeared flat, there would be voids where the OSB had 'valleys' in its surface.
I am curious as to what you are trying to do. Veneering is used either where solid timber is prohibitively expensive or unavailable andtends to be on small decorative pieces - jewellery boxes, fine furniture etc - or in large panels that can then be used as panelling or cut down. These are readily available from suppliers. What is it you have in OSB that means you need to veneer it?