Any tips with applying these sheets? I understand you use some paper in-between the iron and timber.

I've heard rumours of difficulties/failures. In the past I used clean veneer and some titebond, but if their glue works, I'll use it rather than scrape it off.

It's going on the back of a harp and the back of this one is a flat surface, so no difficult curves to negotiate. But I want it to last.