Any ideas ?

Dazaiki · Jan 13, 2015

Hi having sprayed Vallejo primer onto my model over 48 nearly 72hrs it is still soft to touch and will not feather.

Could spraying to far away cause this? This is the only variable I can think of I pretty much followed everything by the book , no thinner used airbrush cleaned and run through with thinner after.Also

Sprue cleaned wiped down ect...

Also I've tried to give another coat of primer but this shows up all the problems of none feathering , should this have self leveled and hid it?

Many thanks

Daz

Laurie · Jan 13, 2015

Daz. Did you clean the plastic before spraying? Not sure of the process but believe there is a release agent used to separate the plastic from the mould this needs to be removed..

Not sure what you mean on feathering. Normally primer covers the whole thing. Although Vallejo Primer is thin it is not as thin as the Vallejo Paint. I normally for the first coat of primer use about 25% thinner and give a mist coat it can then dry thro itself easily.

Primer does take longer to cure than paint as it is onto bare plastic. Also the plastic should be abraded to give a key for the primer Daz

If all the above does not work it may be that the primer is faulty. Can you try it on another surface.

Come back if the above does not work. Also if you go onto the Vallejo Site they have a 100% customer service. Email them with your problem and normally a couple of hours or so later you get an answer.

Laurie

John Rixon · Jan 13, 2015

how far away are we talking here? I have had instances when the paint had started to dry before hitting the surface, which could easily weaken the bond between the paint and the surface.

Edited to add, also, did you stir it really thoroughly? Sometimes the binder and pigment can separate, and this can cause probs!

eddiesolo · Jan 13, 2015

Either not mixed enough-or too cold. Bring into the house if cold and leave for 48hrs.

Si :smiling3:

Ian M · Jan 13, 2015

Vallejo primer is self levelling you just have to use enough of it. I have just used some on my Spitfire. It needs to be wet on the surface, just not so much that it sags or runs.

It settles down quite well

View attachment 96768

View attachment 96769

First with out and then with flash. While wet it looked like a nine year old had painted it. But as you can see it has dried down to a smooth silky finish.
It could be you are being to "stingy" with the primer and as said buy Mr Rixton, just a bit to far away.

Ian M

ojays · Jan 13, 2015

Laurie.

'Not sure what you mean on feathering'

Feathering is the term used when spraying, to get a very soft/light coating at the end of a spraying stroke. Normally used to blend in an edge of a coating.

Example when spraying onto a flat surface: If you keep the gun parallel with the surface from the start of the stroke until the end of the stroke, you will get an even thickness to the coating.

Example when spraying onto a flat surface: If you point the gun at the surface and move it in an arc, the paint coating will be thinner to each end of the arc, but thicker in the centre.

Google 'spraying term feathering' the diagrams are more understandable!

Gregg

Laurie · Jan 13, 2015

\ said:
Laurie.'Not sure what you mean on feathering'

Feathering is the term used when spraying, to get a very soft/light coating at the end of a spraying stroke. Normally used to blend in an edge of a coating.

Example when spraying onto a flat surface: If you keep the gun parallel with the surface from the start of the stroke until the end of the stroke, you will get an even thickness to the coating.

Example when spraying onto a flat surface: If you point the gun at the surface and move it in an arc, the paint coating will be thinner to each end of the arc, but thicker in the centre.

Google 'spraying term feathering' the diagrams are more understandable!

Gregg[/quote

Thanks Gregg I am aware of feathering just that I could not understand what Daz was trying to get over and explain. Actually this can be overcome as I usually carry past the edge and keep my airbrush as parallel to the piece as possible.

Laurie

Dazaiki · Jan 13, 2015

Hi thanks for the replies , seems there may be a few factors.

1: buy feathering I meant as you sand it back to remove any faults the primer has shown up, then the paint almost blends into the surface. Instead it is peeling like if you get sunburt.

2: I may well be to far away, I took putting down a misting coat first as this.

3: I have thoroughly cleaned and prepared the surface in the correct way.

4: it was stored in a cold place to dry.

It was mentioned to provide a surface for the primer to key onto? Can I ask won't this show through the primer or should I keep building up the coats until that dissappears.

Thanks again guys

Daz

Dazaiki · Jan 13, 2015

\ said:
how far away are we talking here? I have had instances when the paint had started to dry before hitting the surface, which could easily weaken the bond between the paint and the surface.Edited to add, also, did you stir it really thoroughly? Sometimes the binder and pigment can separate, and this can cause probs!

Think this is part of my problem

Dazaiki · Jan 13, 2015

\ said:
Either not mixed enough-or too cold. Bring into the house if cold and leave for 48hrs.Si

Another good point thanks

Dazaiki · Jan 13, 2015

\ said:
Vallejo primer is self levelling you just have to use enough of it. I have just used some on my Spitfire. It needs to be wet on the surface, just not so much that it sags or runs.It settles down quite well

View attachment 98141 View attachment 98142 First with out and then with flash. While wet it looked like a nine year old had painted it. But as you can see it has dried down to a smooth silky finish.

It could be you are being to "stingy" with the primer and as said buy Mr Rixton, just a bit to far away.

Ian M

Think you may well be correct in me not putting enough down. Does this have the effect of hideing any minor scratches in your experience.

Dazaiki · Jan 13, 2015

\ said:
Daz. Did you clean the plastic before spraying? Not sure of the process but believe there is a release agent used to separate the plastic from the mould this needs to be removed..Not sure what you mean on feathering. Normally primer covers the whole thing. Although Vallejo Primer is thin it is not as thin as the Vallejo Paint. I normally for the first coat of primer use about 25% thinner and give a mist coat it can then dry thro itself easily.

Primer does take longer to cure than paint as it is onto bare plastic. Also the plastic should be abraded to give a key for the primer Daz

If all the above does not work it may be that the primer is faulty. Can you try it on another surface.

Come back if the above does not work. Also if you go onto the Vallejo Site they have a 100% customer service. Email them with your problem and normally a couple of hours or so later you get an answer.

Laurie

Thanks for the info the help site mat come in useful. Although everone on here is great anyway [emoji2]

Dazaiki · Jan 13, 2015

\ said:
how far away are we talking here? I have had instances when the paint had started to dry before hitting the surface, which could easily weaken the bond between the paint and the surface.Edited to add, also, did you stir it really thoroughly? Sometimes the binder and pigment can separate, and this can cause probs!

Think I may well vbe guilty of this. It is only the second time I've primed a model. The first time must have been beginners luck lol

Laurie · Jan 14, 2015

Daz I wet and dry with a 1200 or 1500 gauge paper which has been used. Use plenty of water. With this you will not get any ghosting thro of the sanding but it does give a great finish for the primer.

The peeling definitely sounds like the coat has been much to thick. I put on a 25% approx mist coat of primer then a reasonable coat of primer. Vallejo primer is made as a thin coat to avoid losing surface detail. Should be cured at least 24 but to be safe as much as possible. Once the primer has been well cured you can wet and dry as above before the next coat. When cured it does have a good hard finish.

Laurie

Dazaiki · Jan 14, 2015

\ said:
Daz I wet and dry with a 1200 or 1500 gauge paper which has been used. Use plenty of water. With this you will not get any ghosting thro of the sanding but it does give a great finish for the primer.The peeling definitely sounds like the coat has been much to thick. I put on a 25% approx mist coat of primer then a reasonable coat of primer. Vallejo primer is made as a thin coat to avoid losing surface detail. Should be cured at least 24 but to be safe as much as possible. Once the primer has been well cured you can wet and dry as above before the next coat. When cured it does have a good hard finish.

Laurie

Excellent Thankyou

Laurie · Jan 14, 2015

\ said:
Excellent Thankyou

Should have read 25% thinner Daz.

Laurie

Stevekir · Jan 26, 2015

\ said:
........

Does this have the effect of hideing any minor scratches in your experience.

Probably not, in my experience. In fact, the opposite. I (and others I have noted) find that after much sanding of seams to what looks perfect smoothness, apply primer is a good way to detect faults before colour is applied!

Ian M · Jan 26, 2015

\ said:
Think you may well be correct in me not putting enough down. Does this have the effect of hideing any minor scratches in your experience.

Just a tip for you on multi quoting in a reply to save you having to write a handful replies each time.

Step 1: Highlight the text you wish to quote and a reply tab will pop up at the end of the text. Click on that and a reply will start. This is how I got to this part... :smiling3:

Step 2 Right your reply to the quote. As I have also now done o.O

Step 3 highlight the next text and hit the reply tab :

\ said:
Excellent Thankyou

That then appears in the text box that you have open. and you re welcome.

You can add more than enough quotes to a reply. I don't kow just how many, but enough.

\ said:
Come back if the above does not work.

And as you can see you can clip bits out of a post and dont need to quote the whole thing ! Smart.

\ said:
Excellent Thankyou

Glad I could help. lol

Ian M

PS do not miss use the function. lol

Stevekir · Jan 26, 2015

\ said:
Just a tip for you on multi quoting in a reply....

Well well! I have never noticed that. It works a treat. Thanks.

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