Underseal

[iandsm]

Is have some small patches of wood rot on the underfloor of my Motorhome, nothing serious but I will be cutting out the rot and replacing with new marine ply. I was wondering about using some kind of spray under seal to protect the whole underside, just the wood as the chasis is all in good order and galvanised. I was thinking about one of the Ronseal spray fence/ shed products as these are breathable and. I don’t really want to totally seal the wood. Has anyone used these products with success or have any other suggestions please.

 

[Lenny HB]

Fence treatments are all water based these days and will just wash off with road spray.
Deck oil might work will probably need redoing regularly.

 

[CazPaul]

Linseed oil paint is good it soaks into the timber and doesn’t sit on the surface like other paints.

 

[Googlebot]

A mate used to swear by used engine oil. Not a recommendation and I wouldn’t touch it with a barge pole!

Check for drip strips. On an old caravan I had, the floor was only rotten where these were installed wrong and let water sit and run on to the floor. I installed new ones on the awning rails and put a u bend in them. No issues then.

 

[Scotch mist]

I coated (painted) my last new MH‘S underside with epoxy resin , proper job

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[steve 6644]

Linsed oil as Cazpaul says, brilliant stuff and apparantly works on metal too.