If you only wax or seal every 6 months you don't have to worry about a wax buildup because there isn't much left. If you use a natural carnuaba wax, you should re-apply approx every 4 - 8 weeks depending on climate and polish before the first application and then every other time before you wax, that helps prevent any buildup. If you use a synthetic sealant, re-apply approx. every 4 months. Remember, you can't add layers of the "All in One" products because they remove whatever is left from the previous application. If you not using an "All in One", use a polish first, then apply the sealant. Some like the effect they get from layering a carnuaba wax, like "P21S" over a synthetic sealant, like "Autoglym Super Resin Polish", which are very compatible with each other. That way they can apply the synthetic 2 - 3 times a year and re-coat with the carnuaba every 4 - 6 weeks. Once you get your car in shape, it's much easier to maintain. Waxing more frequently isn't really necessary, but it doesn't hurt the finish as long as your not using an abrasive polish or compound. Happy Waxing!