I have one curved staircase riser I need to veneer or otherwise match with hardwood floor. All the other risers are going to be done with thin plywood and clear coated (treads will be assembled from hardwood planks and nosing).
There was carpet installed on those stairs, so the wood underneath is fairly rough, splits, cavities, etc. My first attempt with liquid contact cement (solvent based) failed miserably, there are bubbles and splits, etc.
There is no way I can think of clamping it over whole area (especially the curved part), so whatever is used should stay put with minimal support.
For the next attempt I'm looking at sanding failed veneer down to base wood and applying new layer with polyurethane construction adhesive (PL Premium, or one of the variants). The idea is to heat it up a bit so it flows better, spread it evenly on the vertical riser with a trowel or a roller, then apply paper-backed veneer, roll it out to get an even surface (small waves are ok), then support it with a few boards (might actually sit fine as is).
The idea is that PL will fill the cavities and act as a bodyfiller under veneer, and if I manage to get a fairly smooth surface, it will stay like that forever.
The floor and stair are in natural maple, so any kind of light wood look should blend well.
The question is: will this work? Does anybody use polyurethane glues for veneering? What problems should I anticipate?