how do I re-finish this damaged oak veneer front door?

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So I have an oak veneer engineered front door. The varnish is cracking away at the bottom where it gets rained on (its under a porch area so doesn't get fully rained on). How would I go about renovating this door? Do I sand it back and re -varnish it? what products do I need?
 

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Can you post photos?

Did you varnish the underside of the door? You may need to take it off to seal the underside properly though.

Whatever you do, you need to make sure that you don't sand through the veneer.
 
Can you post photos?

Did you varnish the underside of the door? You may need to take it off to seal the underside properly though.

Whatever you do, you need to make sure that you don't sand through the veneer.
I just posted a couple of pics. I didn’t varnish the door myself so I don't know whats underneath. How thick will the veneer be?
 
You should be ok to sand that back. The main problem with oil based varnish is that you need to sand all of it off. If you don't you will see where it has been touched up.

Personally I am a recent convert to the exterior OSMO oils. Provided that the wood doesn't get a chance to discolour, you can just wipe another coat of oil over the top.

I suspect that your door hasn't been sufficiently sealed on the underside. It is quite common given that the decorator isn't generally expected to take the door off to seal the underside, and in reality, most chippies (not all) don't want the hassle of applying a slow drying finish to the underside which may end up rubbing against the carpet.
 
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You should be ok to sand that back. The main problem with oil based varnish is that you need to sand all of it off. If you don't you will see where it has been touched up.

Personally I am a recent convert to the exterior OSMO oils. Provided that the wood doesn't get a chance to discolour, you can just wipe another coat of oil over the top.

I suspect that your door hasn't been sufficiently sealed on the underside. It is quite common given that the decorator isn't generally expected to take the door off to seal the underside, and in reality, most chippies (not all) don't want the hassle of applying a slow drying finish to the underside which may end up rubbing against the carpet.
So I have to sand the whole exterior side of the door first? And are you using the Osmo UV protection oil? Would “clear” be the one to go for?
 

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