Paint went hazy

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ging84

Original Poster:

8,831 posts

145 months

Thursday 29th October 2015
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I tried to do a diy repair on a scuffed door, i used the same process i did on a repair earlier in the year which gave me a really good finish. This was to do several coats of paint, rubbed down with dry P800 20-30 minutes after painting between coats. The final coat was not rubbed down at all, left for 20 minutes and then given 2 coats of lacquer leaving 20 minutes between coats with no rubbing down. This gave me a really good finish last time, but this time completely hazy.
The 2 main difference are that it was a bit colder this time, and i got the paint off the shelf from halfords.

What do you think went wrong? and what should i do to sort it out?

domster

8,431 posts

269 months

Thursday 29th October 2015
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It depends whether the milkiness or cloudiness is in the top surface of the lacquer, or caused by it lifting from the colourcoat beneath. So wet sand it a bit and try machine polishing it to 'clear' (once fully hardened). If in the top surface, you'll have a result. If not, it will have lifted from the colour coat and you'll need to sand it down to the colour coat or simply key and repaint over the top. I suppose the lacquer itself could be cloudy and applied too thickly, but adhesion/surface issues are perhaps more likely.

finlo

3,731 posts

202 months

Thursday 29th October 2015
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Too cold and damp for painting now.

finlo

3,731 posts

202 months

Thursday 29th October 2015
quotequote all
Too cold and damp for painting now.

paintman

7,669 posts

189 months

Thursday 29th October 2015
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Have a look at this:
Blooming/Blushing: http://www.hmgpaint.com/knowledge/troubleshooting/...
Very common with cellulose/single pack solvent based paints in cold weather.

tonymor

1,476 posts

171 months

Thursday 5th November 2015
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I've watched a YouTube video of a repair to laquer peeling off .
That suggests an ultra fine wet and dry to get the flaking off and then reaply the laquer . I'm tempted to give it a try when weather allows .

paintman

7,669 posts

189 months

Thursday 5th November 2015
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I'd be very surprised if the base coat (the colour coat)in the peeled area didn't look slightly different to the rest of the panel after that type of repair. Esp if the base is metallic, if you sand it it will show.

Squiggs

1,520 posts

154 months

Thursday 5th November 2015
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paintman said:
I'd be very surprised if the base coat (the colour coat)in the peeled area didn't look slightly different to the rest of the panel after that type of repair. Esp if the base is metallic, if you sand it it will show.
What he's saying!

It's more or less impossible to sand (feather) the lacquer edges without damaging the underlying paint.
Any sanding damage to the paint will show - and if the original paint mix had even the slightest hint of metallic or pearl in it then the slightest sanding damage will show up ten fold.

E-bmw

9,106 posts

151 months

Friday 4th December 2015
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finlo said:
Too cold and damp for painting now.
^^^^^ Wot 'e said.

You can, of course get round that by using one of the below solutions I have used at home for many years successfully.

A good quality hair dryer played across the area to gently warm the paint as it dries.

An Infra Red barbeque/outside heater works just as well.