Just realized you'd asked about kapur. Good choice.
Here's a bit about it:
Appearance
Kapur timber is lustrous with sapwood that is clearly distinct from heartwood. The sapwood ranges from almost white to light yellowish brown in colour and is clearly demarcated from the heartwood, which is red to reddish brown. Kapur wood exhibits variable grains from straight to spiral, to deeply interlocked grains that create a striking figure. The wood has a moderately coarse to even texture.
Common Applications
Kapur is suitable for general construction: posts, beams, joists, rafters, fender supports, telegraphic and power transmission posts and cross arms. It is used in door and window frames and sills, flooring, staircases and internal joinery. It can be used to make pallets (heavy and permanent types), tool handles (impact), internal plywood, laboratory benches and columns (light duty). In domestic flooring and internal fittings where a finished appearance is important, care should be taken in fixing because of its tendency to develop an unsightly black stain in contact with iron nails, screws or other fittings.
Workability
Kapur's working properties are good with a moderately hard rating (rated 3). The timber machines well, being easy to re-saw and cross-cut when green, but more difficult when dried. There is a moderate blunting effect on cutting edges caused by the presence of silica in the timber, which can be severe where the grain is interlocked. The material tends to break out at the bottom of cuts in cross-cutting and narrow band sawing. Planing is easy and produces a rough surface. Pre-drilling is recommended when nailing near extremities, but otherwise the timber takes nails and screws well. Polishing, staining and painting are also easy. Steam bending qualities are rated moderate as steaming operations release resin.
Origin of timber
Asia
I'd recommend hand selecting boards for grain matching (if you are concerned about those things). Stay away from the sap wood, make sure you get heart wood. High resin content wood so I don't know how well epoxy will stick to it. I've no experience with that species. Your varnishes should, however, adhere well - at least according to what is written about it.
Good luck - it's a very pretty wood!
dj