paintshields are not very new or novel products... they have been around for quite some time.
they are extremely popular amongst sg owners due to the limitation of diy car wash facilities. pro car detailing isnt really all that cheap. (think double)
how effective are they?? well, effective to a certain extent but most require some kind of maintenence back at the pro auto detailing place... and most charge a fee for this. so, it not a one time cost. it might work out to be hefty with the ongoing costs. :nyehehe:
the paintshield also layers on top of the clear coat... if the surface prep is not performed impecably, then the impurities will be sealed inside the paintwork. due to the thickness of the paintshield layer, it will also look like "orange peel" wavy on the surface.
it does have it merits though, as it protects contaminants from seeping in as fast. there are many different types in the market and not all costs rm15k to do one car. for rm15k, imho, it prolly worth respraying the car with glasurit paint system which is much harder than your usual paint systems e.g. dupont.