Dulux water based satinwood over Johnstones oil based undercoat ?

3 Jun 2016
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United Kingdom
Hi there,

I've been working on the woodwork in the front lounge. It's an old house so the woodwork took a fair while to get back to a good state. I applied a bright white water based primer about a year ago and got on with other things. In the last couple of weeks I've finally got back to the job and applied Johnstones undercoat only to realise fairly quickly it wasn't water based. Anyway no problem I'll just use a non water based satin top coat. Here is where I hit issues, firstly the non water based satin seems to have a fair bit more shine than I was expecting. I used Dulux once on the window sill and it is really glossy, not satin like at all. I then used some Johnstons non water based satin on a small section of wood work elsewhere in the room and again it's fairly glossy but not as much as the dulux.

What I really want is the look of the Dulux water based satin wood as that to me looks more like something between satin and eggshell which I like. So with that in mind do I need to give the Johnstones non water based undercoat a sanding (180?) all over before I apply the dulux water based satin, or can I apply it straight on, or so I need to sand and apply a water based undercoat first ?

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Painting over OB U?C is fine. You just need to leave it a few days for the solvents to evaporate. If you paint too soon, you may get fisheyes in the paint (read: little craters where the WB paint has been pushed out of the way by the solvents).
Ah thanks for that, so painting water based on oil based undercoat isn't the same as over oil based top coat then ?
Ah thanks for that, so painting water based on oil based undercoat isn't the same as over oil based top coat then ?

Almost the same but, as I said, you need to wait longer for the OB to cure sufficiently.

Whenever my customer specifies a WB wood finish I try to use OB undercoat, primarily because the OB UC is better at obliterating the existing colour, it is easier to sand flat (doesn't clog the abrasives) and it reduces the level of suction more than WB UC.
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Great thanks for that. I will give the UC a very light sand I think to remove any slight imperfections and then apply the WB top coat.

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