I have a dark coloured car and water marks is my biggest problem.
If i've coating and add wax as the LSP, will it stop water marks?
Most of the coatings I tried are actually more proned to hard watermarks (those that can't be removed by normal shampoo wash) as compared to traditional waxes/sealants. Maybe it's because those watermarks can be washed off together with the portion of the waxes/sealants on top. As the coatings are more 'permanent' in nature, they would need a harsher method to remove, i.e. chemically or mechanically. I've only found one coating that was able to withstand the chemical that I'm using to remove the watermarks, without compromising it's beading/sheeting properties. The others just can't take that sort of abuse.
If your concern is just watermarks, topping up a coating with waxes/sealant would be an option, but IMHO, it's a bit of a waste as:
1. Waxes/sealants on a good quality coating won't last a long as on bare paint so you'd need to top up more often than normal.
2. My experience in using spray wax/sealant is that they are even more prone to watermarks. Maybe the coating has some effect on it's bonding/strength.
Which comes to the question: why use a coating that is inferior to wax/sealant (strictly speaking in term of protection against watermarks only)?
Of course, a good quality coating does give that 'extra' layer of protection against harm to the cleat coat IF the wax/sealant failed, but it would negate the convenience of having the coating when we have to double the effort in protecting the coating itself. Not to mention spending the extra for the coating when we still need to spend the same amount (or maybe more) for the wax/sealant....
Hrrmmm...I'm not making any sense again, am I.....
Anyway, the only way to find out is to try it yourself la (though it would be quite an expensive task to do). One thing that is definite though, don't take the words/reviews of the 'mat salleh'. Our weather/environment here are far different from them and, most of the time they just don't work as good as they say. Also, careful with our local seller/dealer/distributor....well....you know how most of them do business...
OK...I'm just in one of those negative moods tonight, so just don't take my blabering too seriously la. Just one of 'those days'....hehehe