I don't think Mopani holds a lot of water.
If the GS foam is the same foam I use it's even better to have the background sprayed with water first. The water makes the foam hold on better. So if the wood is still a bit wet it's no problem.
If the GS foam is the same foam I use it's even better to have the background sprayed with water first. The water makes the foam hold on better. So if the wood is still a bit wet it's no problem.