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post #9 of (permalink) Old 13th October 2010
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Re: Which Undersealant and is it worth doing

One of the big advantages of Waxoil i sthat it can be thinned using standard white spirit for easy spraying - even a garden sprayer can handle it.

Also you can spray it around the metal ends of brake flexi-hoses without fear of damaging the rubber parts. As anyone has worked on older cars will know the metal ends of flexi-hoses are prone to corrosion. As it's translucent when applied it won't hide any areas which require inspection during MOT.

Many years ago I remember seeing a simple de-watering test using two sheets of steel both with similar light rusting. One was coated with Waxoil the other in plain old clean engine oil . The sheets were positioned at 45 dgress to the vertical. Water from a watering can with a rose fitted was used to apply 1 litre of water to each. Guess which one repelled the water quickest. Any globules of water left on the Waxoil treated sheet were very small indeed and therfore were more likely to evaporate the faster.
Whilst Waxoil is more expensive it takes less to do the job and can beasily sprayed inside cavities and doors if required and doesn't block any vital drainage points. Clean up is easily done with basic white spirit. The hardest part is coaxing the stuff out of the tin.
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