Well, I am one of the few here that like Zymol products. I have been using Zymol Fanstasy wax and HD-Cleanse since 1995 with great results.
I don't find the product expensive at all. Such a little amount is used per waxing that it lasts for years. I have my first container of Fantasy since 1995 and have waxed 29 times with it. I've waxed our Westfalia van, Miata, and our Golf. The secret to using the product is to use it very sparingly. The base must be prepped well with HD Cleanse initially for the wax to stick.
Yes, you have to wax within three months. The wax actually does last that long. Maybe it's the moderate climate I live in (Vancouver, BC). I use it on my daily driver. It beads right up and water beads right up without a problem for three months. I usually give a maintenance coat every 6 to 8 weeks. Our car is garaged nightly.
The reason HD-Cleanse is hard to use is if you have a lot of silicone or petroleum products on your paint. The more impurities the harder it is to remove, and successive applications of HD Cleanse must be used. I clay and HD-Cleanse annually and a maintenance coat of wax every 6 to 8 weeks. I spend about 2 hours with HD Cleanse before waxing. It takes me about an hour to wax our car. It's very easy to use as you don't let the wax dry. Maximum 30 seconds, then gently buff off. With another cloth, buff a little harder, and job's done. After waxing, I wet the car down with water, towel dry, and then buff again to a brilliant shine.
In fact the stuff works very well for me. I don't use their cleaner wax.
Another thing is that after the car is waxed, you must be careful with what you wash the car with. You don't want to remove the wax. I use the Zymol Clear wash soap. All dirt, tar, bugs, just wash right off without any problem.
From what I've read, many people think the product is very expensive and hard to use. That's further from the truth. I paid about $56 CDN for my can of Fantasy back in 1995. I'm still using that same can. How can that be expensive? It literally costs pennies per application as such a small amount is used. Technique is very easy using a two towel approach, and it's worth it IMHO. I've had great success with the product, and enjoy the results. My climate is moderate, and maybe that has a lot to do with it, but my experience over the past 7 years with the products has been very positive.
Just thought I'd share my experience.
Harry.