Question:  Can I put decals on painted wood

Generally yes. It depends, of course, on a couple factors.

The first factor is how rough is the wood the paint is on. If the wood is very rough, it would need to be sanded well before painting it. Then you can stick vinyl to it.

The other factor is how long has it been since the board was painted? Assuming the board was relatively smooth, you should wait,

Question: Do wall stick-ons damage walls?

Do guns kill people? The only way wall stick-ons (more commonly called wall stickers or wall decals) will damage your wall is if you don’t follow the instructions for installing or removing them.

Basically, to prevent wall damage from wall decals, simply make sure your walls are freshly painted or de-greased before applying your wall decals, then, when you take them off, if needed, use a hair dryer or heat gun to help the glue to release cleanly from the wall.

Question:  How do I select the right size/dimensions for my decals?

How would you decide what car to buy or what size house to build?

You have to ask yourself similar questions. If you’re buying a car for utilitarian reasons – such as “we just had our 14th child and we need more than a Volkswagen Beetle now” – you will likely decide on your new bus, er, vehicle based on legal requirements that each child should be in a car seat or buckled up with a seat belt,