Steve Brodie
SMF Supporter
And that must be the answer - Vallejo paints and (couldn't find my Vallejo thinner in my airbrush kit anywhere) Tamiya Thinners. Only used them as I had tried to thin some paint with the Vallejo airbrush cleaner, but after that didn't work, tried the 'bad combination' - oh well lesson learned - airbrush nice and clean inside now, just need to give it a test.\ said:Sorry Ian, but I've used cheap airbrushes with cellulose thinners neat & have never melted a rubber seal.
In fact, there aren't any to melt in most generic Chinese airbrushes - the only rubber o-rings are in the crown nozzle cap & air hose fitting - neither of which come into contact with paint or thinners.
But you're right about mixing acrylic brands - Tamiya thinners & Vallejo paints will cause a semi-solid mass.
I'll give you that one Patrick it could just be an Urban Legend :rolleyes:\ said:Sorry Ian, but I've used cheap airbrushes with cellulose thinners neat & have never melted a rubber seal.
In fact, there aren't any to melt in most generic Chinese airbrushes - the only rubber o-rings are in the crown nozzle cap & air hose fitting - neither of which come into contact with paint or thinners.
But you're right about mixing acrylic brands - Tamiya thinners & Vallejo paints will cause a semi-solid mass.
A bit like the old one our mum's told us about leaving a tooth in a glass of Coke overnight & how it would have dissolved by the morning!\ said:I'll give you that one Patrick it could just be an Urban Legend :rolleyes:
The myth.\ said:It's not entirely an urban myth. Some airbrushes do have O rings or seals which are not resistant to some 'hot' solvents. The myth is that they dissolve them when in fact they tend to make them dry and inflexible, sometimes cracked, causing them not to do what they are supposed to.
This doesn't just mean parts like the needle packing which will always come into contact with any solvent used but any seals or rings anywhere else (like the nozzle cap) which might be exposed unless you are very careful.
Cheers
Steve
Actually that is true on an Iwata. Darn nuisance they are as well. For me they are\ said:There must be some kind of needle packing at the back where the needle passes into the paint cup on a gravity feed brush
Yes there is. On the Infinity series it's part number 123450. Part 123471 is the retaining screw for what H+S call the 'needle seal'. There has to be something to prevent the medium flowing back past the needle into the back of the airbrush.\ said:In the H & S brushes there isn't a packing and not had problems.
Laurie
Ouch you are right Steve. You devil you looked it up as I know you have Iwata brushes.\ said:Yes there is. On the Infinity series it's part number 123450. Part 123471 is the retaining screw for what H+S call the 'needle seal'. There has to be something to prevent the medium flowing back past the needle into the back of the airbrush.
Incidentally I've had one of my Iwata brushes for over ten years, often use relatively hot solvents and have never touched the needle packing. I'm not sure what you were doing to yours
Cheers Steve Edit: more than fifteen years.
Yes that was a bit learnt yesterday Steve. Think it was probably not having any trouble\ said:Hi Laurie, it's just that I knew there had to be something there for the brush to work. I looked up the part numbers for ease of reference. There are so many little bits and pieces it's easy to get them confused, particularly when typing descriptions over t'internet!
Cheers
Steve
A year ago I had very severe, persistent blocking of my Harder and Steenbeck CR Plus (0.4 nozzle) when using Vallejo acrylic paint. It happened after I had used it to spray Tamiya Synthetic Lacquer, which has Cellulose thinners as its solvent and cleaner. After cleaning it very well I put it away for a few months, and when used for Acrylic it constantly blocked. Even a reamer had no effect. I hade to buy a new nozzle and its cover thing.\ said:The myth.
Is it a fact Steve that if you used cellulose to clean your airbrush that certain inferior rings
(Chinese) would , if not destroy the rings, make them all sticky and then unreliable
when they had "cured". Probably overtime.
Laurie
In my case, I had habitually used Vallejo Model Air and then Vallejo Airbrush Cleaner to clean the AB (0.4 mm needle) many times, successfully. Then, faced with a model with deep incurves where using a spray can would have flooded nearby areas, I used my AB to spray some Tamiya Lacquer (by spraying some from the spraycan into the AB cup.) I then immediately thoroughly cleaned the AB with Cellulose Thinners (the solvent in the lacquer) from a tin bought in a DIY shop and put the AB away. A couple of months later I used the AB to spray Vallejo Model Air and that was when I got persistent blocking for several later airbrushing sessions. As usual, I thoroughly cleaned the AB with Vallejo AB cleaner after each Vallejo Model Air spraying session. I still got blockages. I reamed the nozzle. No help. I bought a new nozzle and needle and for the couple of AB sessions since I have had no problems.\ said:Dont mix and match paints / cleaners - as you guys already pointed out
For FULL Forum access you can upgrade your account here UPGRADE