I have a Binks rated at 130PSI or so (I forgot the exact rating). I work between 40-70PSI. I would never trust anything that isn't rated for more than I use.
That one you linked looks a lot like one of the ones you'd get from Harbor Freight. It looks shady. I'd stick with something known to be good. There are many sites out there with recommendations on good cheaper pots
As for compressors, a good cheap one is plenty. The main one I use is a tiny ass cheap one. You don't need much in the way of a compressor, just reliability.
I'm not an expert on casting Frogbot, but wouldn't a vacuum chamber and compressor be the common choice for getting bubbles out of the casts?
I just did a quick search on ebay, and there are quite a few vacuum chamber sets around 200$+.
They are usually described as silicon casting (or shatter purifying...xD) designs, so I'm not sure if they are appropriate/powerful enough for resin casting?!
Heres a few links for reference: :)
01 (http://www.ebay.com/itm/3-Gallon-Vacuum-Chamber-and-3-CFM-Single-Stage-Pump-to-Degassing-Silicone-/271698872364?pt=LH_DefaultDomain_0&hash=item3f4283c82c)
02 (http://www.ebay.com/itm/Pyrex-3-Quart-Vacuum-Chamber-Kit-for-Degassing-Urethane-Silicone-and-Extracts-/281301106837?pt=LH_DefaultDomain_0&hash=item417eda4095)
03 (http://www.ebay.com/itm/Shatter-Vac-1-75-quart-Vacuum-Chamber-3-CFM-Pump-for-Extracts-Concentrates-/301334247961?pt=LH_DefaultDomain_0&hash=item4628ebba19)
It would definitely be awesome to see what you can make with one since your casts already look amazing! :thumb:
Edit: Typos & Nubbs was faster
Thanks for tip FoC_Tow! I've got a Ghetto Vac Chamber that I thinks working pretty good, no micro bubbles but I'm still getting bigger ones. I've tried some casts using a vac the whole way but It's creating caps that are just skin(resin just lines the walls)!Show Image(http://i.imgur.com/sQX42kg.jpg)
I'm wondering if the vac would cause a two part mold (top & bottom) to thin out the walls by sucking out the resin and therefore create thin walls.
But then again the pressure around the mold should be the same so idk if that might happen...
Could you eventually use a vac after mixing the resins, to remove most bubbles created from mixing already before casting the molds? =)