I think that woodgraining is one of those things that when you do it with one of the home-remedies, --and then you see & compare to a pro job and your heart just sinks. I know mine did until I stepped up and bought the plates and all the pro tools. Also it boils down to how accurate you want it to look. If you truly want to fool most people into thinking the mouldings are real Mahogany, you ain't gonna do it with the smear technique or chopped brush bristles because the tight grain uniformity that is seen in the real Mahogany wood is difficult at best for the average non-artisan's hand to replicate.
Also, Woodgraining is expensive because there is a 'helluva' lot of work that goes into it! You can save some expenses by doing much of the prep work yourself such as welding up all the worn aeas on the edge, mediablasting them yourselves, bodyworking them yourselves and having them in sanded primer ready to have the basecoat installed. By "some", that is probably a third to maybe one-half of the expense right there. Then, contrary to what many initially think, applying the ink in a uniform AND realistic manner requires some skilled technique that does not get applied in one quick swoop. Even watching the Pro's at demonstrations & workshops found that it is not uncommon to see them spend from 15-30 minutes on each piece properly applying the pattern and detailing all the corners & edges. This is prior to applying the clear-coat over the ink. So add up how many pieces you have and then put a 'time count' on the set and you can see how it takes alot of time. Then comes the clear that encapsulates the ink. It is really difficult to lay the ink and then keep it debris-free until it has the first coat of clear sprayed. Any spec of dirt or debris that lands causes the piece to be wiped off and re-done in that area, --or the entire piece re-done because when you try to wipe the debris off it smears the ink. One other point, the first coat of clear is usually applied very dry (little solvents) to keep from running the undried woodgrain ink. After it has flashed, the next coats are applied wetter however painting them to flow out slick is very difficult at best. Even with a nice flow-out, most people want to see a finish equal to real varnished Mahogany, ...which comes from carefully wetsanding the clear and hand buffing each piece to a lustre. I trust you can see how labor intensive the entire process can be from A to Z.
Gerard, specifically about your garnish pieces. If they are perfect yet just have faded, is it possible you can take some lacquer clear in a spray can and apply overtop of the garnishes to bring out the lustre again? While it won't be perfect, if it is factory graining it will come close to matching the factory graining already on the window moulding. If the window mouldings have been re-done in the past, matching the artist's pattern & colors may be a real headache for you. Good luck!!
.