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Best Flash to Protect Exposed Outdoor MDF Board

westes Zone 9b California SF Bay
last year
last modified: last year

I have an outside shed where the rafters were apparently done using a cheap MDF board, and improperly sealed on the ends. You can see in the photo below that these are cracking and expanding after about eight years outside. I should have detected this a long time ago, but at this point what is the best way to properly water seal these, so that at least I stop increasing the damage each rainy season?

The materials I have on hand are:

* Quad OSI, very heavy-duty outdoor liquid flash, the color black

* A general-purpose indoor / outdoor flash, the color white

* Olympic Waterguard, spray on water sealer

My vote would be to cover it in the heavy-duty Quad OSI, then paint over that to match the trim color, then water seal on top of the dried paint.

What is the best way to do this?









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