Bitumen is, in a word, asphalt, a liquid version. You can use the stuff you paint on an asphalt driveway to seal leaks, or in roofing. There's a car undercoating that's mostly bitumenous. I've used the liquid asphaltum that's used in etching. Try a Home Depot, Lowes or an auto supply store; tell them what you're looking for.
Bitumen seems to be the word used in Australia and New Zealand; maybe in Europe?
I'm on the east coast too and I have yet to find anything in a store that looks like what Gary uses. The stuff I found at Lowes was a different consistency. I bought mine online at http://www.noxudolusa.com/noxudolstore/ccp0-prodshow/N1600C.html
This noxudol 1600 is bitumen based and looks exactly like what Gary uses. I've had mine for quite a while and it lasts and lasts. This company shipped pretty quickly also.
This came up frequently in the Textures class that Gary ran earlier this year. Many people said they struggled to find it and various options were considered. I just checked in the pdf we got as part of the class, he suggested for those in the USA they try to get hold of DAP Liquid Asphalt Crack Filler, or alternatively Nuxodol, which can be bought online and he gave a link for it here. Another alternative is to use black shoe polish. I hope this helps. Beverley
Yes, black shoe polish will work, too....But...if you ever want to seal your work with a poly of some sort ( I tried it on some of my artboxes) the poly will eventually peel off because the wax will not let it "grab" the way it needs to....just thought I would share my experience....the liquid asphalt filler works better!
I finally remembered what I wanted to note, but Mary Barfield beat me to it: http://www.noxudolusa.com/noxudolstore/ccp0-prodshow/N1600C.html I too ordered online without much delay and no problems. And the stuff lasts forever. It can be a bit gritty so if you're looking for something smoother just strain through cheesecloth.
Yes, it was 1600. Just seemed a little gritty when I used it so I strained it, or tried to. Not really a problem because it didn't affect the piece when I wiped it off. But 1600 is thicker than the liquid asphaltum used for etching. Liquid asphaltum seemed almost too thin for what we were doing in the online class.
If you can't find liquid asphalt crack filler at Lowes or Home Depot, check your smaller hardwares. That's where I found mine. Ask for the driveway crack filler. The smaller stores even have it out of season.
So once i have my image printed onto transparency film, I take my Ezscreen silk screen which has been coated in light sensitive emulsion (These sheets come pre-coated so they are ready to use). Place it onto a black board, then place the transparency image on top (this part needs to be done in a dark room with no direct sunlight). I take it outside and expose it for 1 minute and 40 seconds (but time varies depending on time of day and strength of sunlight). After i have exposed the image i place it into a tub of water for around 5 - 8 minutes. Then i rinse the screen out under fast running water until the unexposed area (the black) washes away. I then expose the screen to the sun for a further 20mins to completely harden the light sensitive emulsion.
And this is the completed screen ready for printing. I simply use an old credit card to spread the ink over the screen making sure i do one complete full stroke across the screen (holding the credit card at a 45 degree angle). I immediately wash the screen out under fast flowing water and pat dry. I use fabric screen printing ink which washes out in water (which makes the process easy).
I love this product, their website is http://ezscreenprint.com/ (for full instructions and details on how to purchase this awesome product).