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QUOTE(efaceninja @ Aug 13 2014, 08:16 PM)
want to ask want to ask, after polishing the car (say, Meg Ulti Polish, hand applied), after i buff off the polish with MF cloth, do i need to somehow clean the paint surface with something (assume in the perfect world)?

IPA?? If i don't have IPA, can i just directly go to apply wax?? (ULW, hand apply)
side question 1: IPA is the Isopropyl Alcohol. Where can i buy this kind of stuff actually? in what form? i've totally no clue
side question 2: talking about Ultimate polish and ultimate compound, is M205 & M105 the equivalent???

just a guess following reading some google search results. M105 is like super popular, then i guess that it is Ultimate Compound lols. As Meg consumer line usually have their Detailer line or Mirror Glaze equivalent. Same to Ultimate Polish equal M205, am i correct??

A good analogy would be when you're using glue. Glue something on a dirty surface, it'll peel off in no time. If you wipe the surface clean, it'll stick better and last longer. If you wash the surface or clean it with alcohol or make sure the surface is 'squeaky' clean, only the glue's grade & properties would dictate how strong it'll stick and how long it'll hold. Best bond can be achieve when the surface is perfectly clean, free from anything that could impede the bonding. It's in the nature of a polish to contain a certain amount of polymer or 'oil' either as a carrier or a lubricant. Cleaning down the surface with IPA or solvent after polishing would remove these oil and promote better bonding of the wax/sealant applied. That is the concept of wiping down the surface clean before applying an LSP.
Try it. You'd see/feel the difference. Other than lasting longer, the Wax/sealant would also go on smoother, would take lesser time to dry/flash off and would be much easier to buff off. Couple that with 'baking' under the sun after applying and buffing off (to better 'cure' the wax/sealant - like baking the car in the oven after painting), it'll make the wax/sealant perform at it's best.
It's not ESSENTIAL that you do so, but it's worth doing it if you got the time. But since you're using products from the same brand, you should be alright if you decide not to do so cuz, normally, they would make products that are compatible with each other, minimizing any of these issues.
I think there's somebody here in the Trade section selling some good quality IPA.
Yup, UP & UC is the consumer version (with a little tweak) of M205 & M105.