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  1. #11
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    Just had a thought - I've assumed that you're talking about clear resin? If you wanted an opaque resin, there are much cheaper options, which I think can be cast without pressure/vacuum (if I remember correctly)


     
     
  2. #12
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    Quote Originally Posted by fingwe View Post
    Just had a thought - I've assumed that you're talking about clear resin? If you wanted an opaque resin, there are much cheaper options, which I think can be cast without pressure/vacuum (if I remember correctly)
    Thanks Melanie. I want to cast clear eventually, but for now i'd use colour, so bubbles are not as much of a problem for looks, but I was worried about structure?? Pressure pots are so expensive??? Am I looking in the wrong places??

    Kind regards

    Craig
    I've never learnt anything by talking

     
     
  3. #13
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    I'm trying to remember back, it's so long since I did all of my experimenting.

    The problem with any of the polyurethane resins is that they set so quickly, and are generally pretty thick, so that they don't allow much release of bubbles. This gets far worse if you add a dry colourant like pearl ex/mica powder, which introduces LOADS of air with it. Liquid colourants are better, but to be honest, you introduce air as soon as you start mixing.

    I think if you used a liquid colourant, and mixed really carefully, you might get a decent cast, but you will need to fill the odd void that you come across whilst turning. But for the price you're paying for the resin, I think you'd be disappointed.

    Yes, vacuum chambers/pressure pots and the vacuum pumps / air compressors are expensive. You can get cheaper pressure pots, off ebay, etc, but I'm not sure of the quality.

     
     
  4. #14
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    Yes, vacuum chambers/pressure pots and the vacuum pumps / air compressors are expensive. You can get cheaper pressure pots, off ebay, etc, but I'm not sure of the quality.[/QUOTE]

    Again, thank you for your comments (sorry for hijacking your post DJB Penmaker) I don't want to have anything in my workshop that isn't up to standard. I'll try in the summer without pressure and in the meantime turn some pens to raise some funds Thanks Melanie for the good info.

    Regards

    Craig
    I've never learnt anything by talking

     
     
  5. #15
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    No problem, there are several others on here who cast quite a lot, maybe some of them have some suggestions for equipment at decent prices?

     
     
  6. #16
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    I want to start with clear, so it looks like it's the expensive stuff (as usual) it's encasing things that I'm interested in more than producing coloured blanks and from what you say it'll involve a pressure/ vacuum pot too. You've been a great help Melanie, thanks for all the info.
    Cheers, Derek.

    Sent from my SM-G955F using Tapatalk

     
     
  7. #17
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    Yes, putting anything into the resin will introduce bubbles. I have had pretty good success putting stabilised wood into resin which has been vacuumed (I vacuum rather than pressure, purely from a safety point of view), but not re-vacuuming. There were a few tiny bubbles clinging to the wood, but nothing major.

    However, if you're wanting to produce totally clear resin,then I think you will need to do something to degas regardless, as you will be able to see EVERY bubble. If you were using colour, it would mask a lot of them.

     
     
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  9. #18
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    Alumilite is like hens teeth here and twice as dear.

    COOPER 01/08/1998-31/01/2012

     
     

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