yes you can apply PLAIN CARNUBA WAX on top of the sealant
while white looks very clean and prestine. it requires more frequent washing, as dust and grime are more evident on white.
while gray is better for people who cannot frequently wash their cars bec. of busy lifestyles, dust and dirt is not very evident on gray, but you still have to maintain it.
i'll go for grey. bihira na din kasi ako makasingit sa shop, dami tanggap. hehehe






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