What Self-Levelling compound for wood floors?
You might NOT be able to apply a self-levelling compound directly onto a wooden floor, without over-boarding it with Plywood first. If it is on a suspended timber ground or upper floor it will be subject to movement.

The only time you can apply a self levelling compound directly to a timber floor is usually if it is on a solid ground floor. This is not likely to be subject to any movement and the self-levelling compound will not be able to leak through any gaps in the flooring.
If the timber floorboards on a suspended timber floor have any gaps, the self-levelling compound may seep through them. Also, If the individual timber floorboards have any movement in them, it can cause the self-levelling compound to crack.
In the trade, Plywood is often installed over timber floorboards as a precautionary measure. This reduces the risk of callbacks and ensures that there are no problems with the finished floor covering.
The greatest pitfall when it comes to using self-levelling compounds anywhere, especially on wooden floors is LEAKAGE. Wooden floors can often have large gaps between individual timber floorboards.
If the floor is like the one shown above, then you are likely to have traditional wooden floorboards. These will be nailed directly to suspended timber floor joists. This poses our second problem MOVEMENT!
The only way to combat this is to OVERBOARD the floorboards with thin 6mm Plywood (Or rip it all out and do it the modern way with chipboard flooring sheets).
Once the floor has been over-boarded with Plywood a 2-part latex-based self-levelling compound can be confidently applied. A self-levelling compound that you mix with water should never be used as the moisture may be absorbed into the Plywood causing it to expand.
Only a flexible 2-part latex-based self-levelling compound should be used on suspended timber floors.
This type of self-levelling compound comes with a tub of latex and a bag of self-levelling cement, in a premixed ratio. It remains flexible even after it has cured, making it suitable for suspended timber floors as well as solid timber ground floors. It can be applied directly to plywood and almost any other substrate you can think of.
If you have chipboard flooring sheets and they have been fitted neatly with no gaps or steps between the sheets. There will be no need to over-ply it, before applying the self-levelling compound.
Just make sure to use a latex-mixed self-levelling compound similar to the one above. If you use a self-levelling compound that is mixed with water, the chipboard will absorb the moisture and start to expand.