Water bourne and Oil based products have low levels of odour and clear as the varnish dries. Solvent based varnishes can be quite strong and this is exaggerated with the catalysed versions that have a rapid drying time, because of the accelerated evaporation, so be aware of this and ventilate the room with open windows/vents as much as possible and close off to the rest of the property. At the same time we suggest that the heating is on to accelerate the drying time and speed up the evaporation and the extraction.