I have had mixed results in making sign’s using oramask. Is there a written step by step method for successfully using oramask . I’ve had bleeding under even after vigorously adhering the film. I’m also getting sticky residue left on the surface sometimes
Thanks
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Here’s a link to the video I used:How to paint CNC signs using Oramask 813 film - YouTube. USE SHELLAC! I used polyurethane and got the sticky residue. I used shellac like he uses and it worked amazing…no residue! Also, I don’t remember if he does this step, but after you cut it out on your cnc, and before you apply paint, paint the cutout with shellac. That’ll keep it from bleeding. So you’ll want to shellac before applying oramask and then in the cutout. Hope this all makes sense and definitely watch the video. Good luck!
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Surface and seal your wood. Apply Oramask from the center to the outer permimiters, using a credit card or a device such as the folks who apply bondo in the body shop use. Start in the center and work outwards until all bubbles are removed. Cut your design. Seal again. Paint and remove the Oramask. that’s how I do it and it works great.
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When you cut into wood the straws that make up the wood are cut open. When still growing water and nutrients run up the straws to the canopy. So when cut down and dried the straws are still there and ready to adsorb what ever you put on it. As other suggested use dewaxed shellac (Zinnser Universal Sanding Sealer) on your work piece and let it dry. Then apply your masking. I use Easy Shelf Liner Adhesive Shelf paper and for me it works as well as Oramask and is locally available and cheaper. Apply your mask and use a J roller to press it down to get good adhesion. Just hand pressure will not do it. Then after carving apply the dewaxed shellac again on the newly cut wood. Let it dry and then paint. That will help with paint adsorbing into the straws of the freshly cut wood. I use an acid brush I use for applying PVA glue in the shop. After your paint dries then peel off your mask and simply sand the whole surface to remove any over spray of paint and then seal again with the dewaxed shellac and then apply a finish. The dewaxed shellac is compatible with oil or water based top coats.
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I just read a story about a Japanese man that spent $12,000.00 for a custom made collie suit. He had always wanted to be a collie and made his dream come true. There is video of him out in public walking on all fours and playing with dogs and people. For me it is not worth $12,000.00 to look like a collie.
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Oh… I could see doing that! LOL! Thanks for the video. Too bad Fox called this rough collie a border collie. I am not sure I could ever trust them again.
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Are you using spray shellac or brush on ?
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I use spray shellac. It’s quick and easy. I have occasionally gotten a bad can that spits globs out but it is pretty rare. There is a shelf life though so using a 3 year old can is probably a bad
Idea.
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I’m using brush on. Dries really fast too.
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I buy quart cans of Zinnser Universal Sanding Sealer (dewaxed shellac). I wipe on with a rag and use an acid brush to get down into the carving.
You can get these acid brushes in several sizes. I use it for shellac as well as spreading pva glue. On the pva glue you can wash out the brush and use it over and over. For shellac I generally brush out the excess on the spreading rag and mark it and can use it several times. They are cheap but I am also cheap and like to use them until they are unusable.
dump oromask… use drywall paste. I used to use oromask
Sounds messy.
How long do you let it dry?
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I have seen videos where people use drywall mud on the cut edges of MDF to get a smooth surface for painting. Drywall mud should dry 24 hours. However depending on atmospheric conditions it may be less to just carve but you want it mostly dry to keep it off the bit.
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This was a surprise. My favorite books when I was a kid were written by Albert Payson Ternune.
Wolf
Lad, a Dog
And a bunch more.
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What pound cut do you use?
What do you mean use drywall paste? can you give a little more info?
What pound cut do you use?
I’m sorry. I’m new to CNC so I don’t know what you mean by pound cut???
Pound cut for the shellac, I meant. If you’re using Bullseye brand, the seal coat is a 2lb cut so is thinner and penetrates deeper. The standard shellac is more like a 4lb cut, so much thicker. Lol, more of a wood working question than a CNC one.
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