How do you prepare a surface for gloss paint?

If the surfaces (doors, architraves and skirting boards) are already painted with gloss/silk how are they prepared if you just want to paint gloss on top? Do you need to just sand down and wash? Do you need an undercoat if you just use the one-coat gloss? Will one-coat gloss adhere to unsanded painted doors? Is it best to use a roller rather than a brush?





Thanks.How do you prepare a surface for gloss paint?
To do a good job, you will first have to sand the area to roughen up the area. Sanding gives the paint something to stick to. Then you should apply a good quality primer. and then finally a coat or two of you gloss paint. Use a paint brush for this particular job, rollers are better for walls and ceilings. Paint will not adhere good to any glossy surfaces, it will just peel away.How do you prepare a surface for gloss paint?
Just clean the surface with a mixture of bleach and hot water and use the same basic kind of paint that's on there already (latex over latex, or oil over oil) and it should adhere without needing to sand (bleach easily softens and dulls old paint finishes to make them tacky and improves adhesion). There's no need to undercoat with a primer unless the old paint is a completely different color or if there are a lot of areas where the old paint has come off the wood.
you need to get some decent sand paper, ie the aluminium oxide paper that you can buy from any d.i.y shop, sand down the woodwork so that they are really smooth, make sure that ypu dust down the skirts and frames before painting as the dust tends to stick to them.


Apply one coat of undercoat and when this is dry give the frames another light sand, this removes any dust.


You don't need to use one coat gloss, normal gloss will be fine, personally i've stopped using gloss as the finish doesn't stay white very long due to the oil content in the gloss - i use water based satin, there's no smell and easy to apply and stays white for years, the only downside is that you need to apply a few coats to get a professional finish
rub down the skirting/architrave with p240 grit aluminium oxide paper (fine grit paper equivalent) if the surface is in good order and just needs a repaint.





All you want to do is remove the sheen of the old gloss and give the new gloss a key to stick too, then dust of the surface and wipe with a clean damp cloth





You don't need to undercoat as the old paint will act as this and as long as you haven't rubbed to hard and have bare wood showing your good to repaint over this, i would use dulux non drip gloss its excellent paint, its very easy to use and you will get hardly any runs which are always possible with gloss. you only give gloss one coat, you cant gloss over gloss as someone has said it wont stick very well, gloss is the last stage in painting you only paint an area once with gloss never give it a second coat this is wrong.





If your surface is in poor condition like lose flaky paint and needs filling you will find that undercoating first then glossing will give you a better finish





to apply gloss i use a 4in mini roller with a sponge sleeve/head and a good quality brush, i apply the paint to the surface with the roller to get an even coverage (this way you reduce the chance of too much paint in one area and the dreaded runs), i then ';lay it off'; with the brush (go over), if I'm painting a large area with gloss like a door its easier to paint it in sections
sandpaper
sand all surfaces lightly, wipe down, paint. no primer necessary. you will most likely use more than one coat of paint so go ahead and be prepared and buy extra.





hope this helps. :)
A light sanding, just enough to give the new paint something to key to. It's also worth washing down with Sugar Soap (from any DIY store) which gets rid of grease that can reject paint.


Depending on your surface you shouldn't need to undercoat (unless its really bad and to get it smooth you have to take it back to bear wood or unless you are making a major colour change).


I wouldn't use a roller and I also think standard high gloss paint as opposed to non drip can give a better finish but you do need a bit more care when painting.


It's a lovely day, why not go for a walk and think about it!
rub down then under coat,light rub down again before glossing,that one coat gloss is ok but loses its shine far to soon in my opinion
Sand down, undercoat (if you can be bothered) and then gloss with a good quality brush.
you can probably get away with sanding with a fairly fine sand paper (gently) then painting, as i guess your trying to be quick.





To do it properly sand it al medium then fine papers, then prime it, hten undercoat twice, then gloss twice. That gives the real lustrous shine to gloss.





Make sure you brush off the sanding dust else it will mess up the paint