Reactive
(high-solids) finishes cure by chemical reaction and require less
build-up (coats) to fill open grain woods. They have less shrinkage
than solvent-borne or water-borne "evaporatives" - those that cure by
drying. One problem in applying reactives to oily woods is that the
natural oils in the woods interfere with the curing of the reactive
finishes. Shellac is often used to seal the grains on oily woods but
this takes a fair amount of time. Solarez UV-cure grain filler and
sealer reacts not by evaporation but by photochemical reaction and does
so in seconds, not hours.