renovating paint finish on white , grain effect, wardrobe doorsfol

I am nearing the end of redecorating my daughters bedroom. Actually a major job , chimney removal , repair floor , new ceiling , extend ring main, fit skirting board ..
But now I am at the cosmetic end of the job.
Pre existing in the room across one wall is a built in fitted wardrobe. Most of the front is taken up by 2 sets of folding door panels. This was inherited with the house & I have retained it as a major storage feature. The doors are those white subtle grain effect that a lot of internal doors have these days.I had presumed made of MDF but on examination they are a timber construction face paneled with whatever board that carries the grain effect. Presumably they are finished (painted?) as part of their manufacture.
Anyway , while generally ok they look a bit tired in contract with the new paintwork around them. At minimum they need some scratches touching up but preferably a paint job.
Is there any way I can repaint without loosing the grain effect.
There is Ronseal MDF/Melamine paint ? but presumably this would leave a smooth finish.
I think I have seen kits to create this grain effect on MDF ? but would this work on top of an existing surface.
If a recoat is impossible what paint should I use for touching up & any suggestions for anything to bring the surface back closer to its original brilliant white.
Thanks for any ideas
Richard
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Jack Fate wrote:

Applying an oil based paint with a rag would probably be your best bet. Standard "liquid gloss" rather than the quick drying acrylic stuff.
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Thanks
I will give that a try. Perhaps thinned down a bit with white spirit ?
Richard
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