Can't find the sources i originally had but the links below go some way to explain.
Why spirit of turpentine:
http://cambridgetraditionalproducts.co. ... ure-polish- slower drying time allows for better penetration
- mineral turps/white spirit is quite harsh and can actually strip natural oils and dry out the item that you are attempting to feed and protect, damaging the grain and leaving it more susceptible to moisture ingress/egress: the point of a good timber conditioner is to stabilise the moisture content of the timber, thereby minimising movement and checking in the grain.
- spirit of turpentine, being derived from natural vegetable (pine) resins and oils is far less destructive to natural oil and waxes, such as bees wax and raw linseed oil
- being a petrochemical compound, mineral turps can break down natural oils such as linseed and beeswax
- all of the above results in a "deeper" finish and lustre (yes, that's where the term comes from)
Why raw linseed:
http://www.thefurnitureconnoisseur.com/ ... il-finish/- slower drying allows for better penetration
- deeper penetration results in a far superior and more durable finish for item exposed to extremes in elemental conditions
- see previous point re: "deeper" finish & lustre
As mention in my post above, modern "turps" and "boiled linseed" were products developed for convenience of cost and application (ie: cheaper and quicker to turn a job around as well as being far more profitable for manufacturers). For a long lasting and effective conditioner and finish for timber products, using the traditional products results in a far superior end product. Yes, it takes a little longer to set but it is worth the wait and when you are talking about a simple conditioning application this is a negligible consideration.
When finishing a new stock in this fashion, it does take some patience:
- 1 coat a day for a week
- 1 coat a week for a month
- 1 coat a month for a year
- 1 coat a year for life
2 parts raw linseed
2 parts natural beeswax
1- 1.5 part spirit of turpentine
Combine in a double boiler: melt wax in linseed first, then add SoT.
Apply sparingly and regularly as a conditioner or liberally to bare timber in multiple coats for a fresh, deep, lustrous finish.
Use what you like; i'll stick to this. Some would just use pure linseed, either raw or boiled but that does take a long time to dry, like a week or weeks.