Satin runs.

[Flocal_1980]

Hi guys, 

I've recently had a bash at painting one side of my boat to see how Satin looks and adhered. I've used Dulux Weather shield Satin and initial results were fairly pleasing for a amateur attempt. My only issue is the morning dew has put a few fair white marks in the paint running from top of boat side to about half way. In the day they are not visible but in the day they are terrible. This morning there was a few drops of rain and they have left white marks after four days of dry weather. 

Can these be removed or have I done something wrong? 

Cheers 

[Chewbacka]

Do the marks disappear after the sun has been on the paint for a couple of hours?

[Flocal_1980]

Yes they do, will probably be gone now and re appear and some more next day! 

Edited May 9, 2018 by Flocal_1980

[Jennifer McM]

Can you not seal the paint with a coat of 'satin' varnish?

Edited May 9, 2018 by Jennifer McM

[Chewbacka]

It’s the paint and not your application.  You could call Dulux technical and ask which colours/textures are least affected for next time you paint.

1 minute ago, Jennifer McM said:

Can you not seal the paint with a coat of varnish?

Some varnishes have the same problem - think coffee tables - Just something to think about.

[mark99]

Painting outside is fraught with issues. Sounds like you may have painted without due regard for dewpoint temp and timing.

Our external painters (not boats but metal) used to use all manner of tools like a whirling hygrometer, temp gauge, shades, and film thickness gauges.

 

Sounds like a paint "bloom".

Edited May 9, 2018 by mark99

[Flocal_1980]

Just now, mark99 said:

Painting outside is fraught with issues. Sounds like you may have painted without due regard for dewpoint temp and timing.

Our external painters (not boats but metal) used to use all manner of tools like a whirling hygrometer temp gauge shades and film thickness gauges.

Yes I'm thinking this was my issue from the start tbh. I put second coat on at 17:30 once the sun had moved round. 

Knew it was a risk but just wanted to get on with other stuff the next day. 

Will probably use a 180 and rough it up and do it again but first light this weekend. 

[Chewbacka]

Just now, mark99 said:

Painting outside is fraught with issues. Sounds like you may have painted without due regard for dewpoint temp and timing.

Our external painters (not boats but metal) used to use all manner of tools like a whirling hygrometer temp gauge shades and film thickness gauges.

I think he is not talking about permanent marks, just those that appear when drops of water sit on the paint and disappear when the paint has warmed up.  New cars in outside storage with white film wrap - where it is poorly applied and water is trapped in patches under the wrap - suffer the same problems, some dealers remove the marks with a hair dryer before customer collection.

[Flocal_1980]

3 minutes ago, Chewbacka said:

I think he is not talking about permanent marks, just those that appear when drops of water sit on the paint and disappear when the paint has warmed up.  New cars in outside storage with white film wrap - where it is poorly applied and water is trapped in patches under the wrap - suffer the same problems, some dealers remove the marks with a hair dryer before customer collection.

You do have a point, warm it up and it goes and will reappear frist thing when it's damp. I'm not standing out side every morning with a hair dryer ?

[Chewbacka]

Mine does it as well, especially where bright sun has shone onto big drops, but it soon goes away.  I just live with it, though if you call Dulux I would be interested in what they say.  It might help if you wax the boat to encourage the water to run off, though you will need to remove the wax before repainting so don’t use a silicone wax as it is terrible with new paint.

[Alan de Enfield]

I think I misread the title :

 

[Flocal_1980]

8 minutes ago, Chewbacka said:

Mine does it as well, especially where bright sun has shone onto big drops, but it soon goes away.  I just live with it, though if you call Dulux I would be interested in what they say.  It might help if you wax the boat to encourage the water to run off, though you will need to remove the wax before repainting so don’t use a silicone wax as it is terrible with new paint.

Yeah it's a pain in the arse, looks awful then disappears. I never intended to get a pro finish, never was going to with Satin. It has its fair share of brush marks but the white lines are doi g my head in. 

5 minutes ago, Alan de Enfield said:

I think I misread the title :

 

??

[alan_fincher]

I hope I'm not being too pessimistic, but note this is a water based paint, not an oil based one.

I'm not at all convinced by the suitability of such a paint on external steelwork.

It is highly unusual, I suggest, to paint a steel boat in anything other than an oil based paint.

[Flocal_1980]

16 minutes ago, alan_fincher said:

I hope I'm not being too pessimistic, but note this is a water based paint, not an oil based one.

I'm not at all convinced by the suitability of such a paint on external steelwork.

It is highly unusual, I suggest, to paint a steel boat in anything other than an oil based paint.

I only used Satin because I didn't want the boat to be a huge mirror like most Narrowboats and on a bit of a budget. Didn't even consider it to be water based Alan if I'm honest, this may be my issue after all. 

I may bite the bullet and 180 it all over and use a different coat to top it off with. 

 

[Alan de Enfield]

4 minutes ago, Flocal_1980 said:

I may bite the bullet and 180 it all over and use a different coat to top it off with. 

I suggest that you try a 'sample pot' of your proposed new top-coat to ensure no reaction between different types of paint - you could end up in a worse mess.

[Flocal_1980]

Just now, Alan de Enfield said:

I suggest that you try a 'sample pot' of your proposed new top-coat to ensure no reaction between different types of paint - you could end up in a worse mess.

I will probably use the same Dulux Weather shield, but a Gloss and tame it down a bit. 

[Flocal_1980]

I am very much a novice and using my boat to learn

[Flocal_1980]

Just had a look and the Gloss is a water based paint aswell! Have read quite a few posts on various outlets of people who have used Weathershield with no issues in the past. 

[mark99]

Checkout the trade version of weathershield.

 

Again sample in case of adverse reaction.

[alan_fincher]

All I can say is that , to my best knowledge, no paint regularly marketed as an external boat paint or as a coach paint is water based.

I have never been convinced of the durability of the water based paints, particularly in external use.

 

I acknowledge that Weathershield is marketed for external use, but although it doesn't say so, I would suggest it is usually used on wood.  There isn't much market for painting external steel in a house based environment.

If I were going to use a paint designed for house use on a narrow boat, I would use an oil based one.

[mark99]

Hang on looks like the trade version is/may be waterbased too. Not 100% sure as on a mobile with tiny screen and poor signal.

Edited May 9, 2018 by mark99

[Flocal_1980]

Thanks for your comments guys. 

I may save a bit more cash and buy some Craft Master or International top coat for the future, atleast the Dulux will act as a decent undercoat once its been on a few weeks and dried thoroughly even if it does look crap with the runs. Will obviously use a tester first. 

Can you recommend a budget (if one exists) boat paint? 

[Alan de Enfield]

2 minutes ago, Flocal_1980 said:

Can you recommend a budget (if one exists) boat paint? 

With paint (amongst other things) I am of the mind that you pretty much get what you pay for.

If you are only going to do it every 5-7-10 years why not do it 'right' ?

[Flocal_1980]

36 minutes ago, Alan de Enfield said:

With paint (amongst other things) I am of the mind that you pretty much get what you pay for.

If you are only going to do it every 5-7-10 years why not do it 'right' ?

Yes that would most definitely make sense, thank you. 

[BWM]

There is an additive that helps avoid bloom when painting in cool conditions called terebine dryer. Only suitable for oil or alkalyd based paint though.