Pockmarked gloss

Yorkie1

Evening all,

This is my next post in the first time of decorating my own house!

Have glossed the window sill and got what I can only describe as pockmarks. (On the sill, that is!) Someone suggested that it might be connected to moisture, as I'd wiped the sill before painting, but I'm sure that I did dry it properly.

Then, in a second room today, having glossed the skirting boards OK, I started getting the same effect on a second window sill. It appears to happen on the horizontal and not the vertical - not sure if that is a relevant factor.

Any suggestions as to cause? Would lack of sanding trigger this? Am just puzzled by it not happening on the vertical - which I'm sure would have been painted at the same time as the sills with the same paint. I think it's gloss already on the sills rather than satin.







Thanks in advance for suggestions.

ilovemydebts

is that not because there is no undercoat, nothing to grip as it were.

Yorkie1

The sills already had paint layers on them before I started so I didn't think undercoat was needed again?

Is the pockmarking definitely a sign of insufficient grip on the original surface?

If so, should I sand it back to below the pockmarks and then start again?

Weird_Nev

1) Sand back the original paint to allow new paint to key in to it.
2) Clean with sugarsoap and rinse it off, allow to dry completely before painting.

Painiting is all about preparation. It's not hard, but you do need to prepare properly.

ilovemydebts

i personally would give a sand to get rid of pots then undercoat to give smooth surface, then the gloss will looks good, if not worried about look, a couple of layers of u/coat then gloss.

Yorkie1

Thanks both; I was relying on my Dad's tried and trusted methods .. I shall be having words!!

I only have combined primer / undercoat. Will that work on top of sanded gloss?

ilovemydebts

Should do the job, once sanded it is not really gloss anymore.

jcb208

Will proberbly of happened even after undercoating first.Theres either polish or silicone based residue on the sill that has reacted .If its just been done the paint will be soft for weeks as it looks like the gloss has been put on quite heavy.To sort it out needs a really good rub down when the paint has hardened,wiped over with meths or similar a couple of water based undercoats and regloss,try to thin the gloss a touch will flow better

ormus

incompatable materials, foriegn matter or poor preparation is the reason for fish eyes.
silicone contamination is a regular cause of fish eyes.

Yorkie1

Thanks; as well as insufficient preparation it could also be silicone contamination as I had DG fitted earlier this year.

Will wait a few weeks for the gloss to harden and then attack it with sander, meths, primer / undercoat and more gloss.

I'll know to prep the other sills as above when I decorate them too.

keystone

It looks to me like its all down to not sanding it flat in the first instance. I don't think its silicone contamination. The indentations in the old paint fill with fine dust which you can't see so it looks flat. Its shifted when you clean it and reveals itself when you paint. So its dust contamination IMHO. Redo it with wet & dry and water by hand and you'll get rid of it. You'll get a decent enough surface to gloss staight on top. When its cured lightly wet & dry again followed by a further gloss coat and you'll get a lovely mirror like finish if your brushwork is good.

Cheers