Is there any dependence between the type of orchid and the type of wood it's mounted on? Could it be that the vandas aren't happy because the wood they're mounted on is giving off something they disagree with?

I saw some inexpensive sandblasted grape vines in a reptile pet store, 2-3 feet long (60-90 cm), about 2" or 50 mm diameter. Very rough surface due to sandblasting, and not a trace of bark left. Would these be suitable for mounting?