I currently have the 16oz kit for clear cast and white. I am going to be ordering the 2gal kit in the nearish future. Is it okay to re-use the smaller 8oz bottles? Or what is a safe alternative for smaller containers if re-use is not a good idea?
Great question. Yes, you can reuse the containers. Moisture contamination is the only worry. High humidity areas are the bigger concern because the empty head space can contaminate the small amount in the bottom of your containers so I'd simply suggest emptying the containers completely by using all of the resin prior to adding new fresh material out of your gallons. This will also help save your gallons as you will only need to open them a fraction of the amount of times if you down pack it in the 8 oz containers and work out of those rather than working out of the gallons.
I have salvaged 1/2 thick large round funnels from OSU Oceanography Dept. They are extremely sturdy. I want to pour a bottom into them and turn them into fish pond pots. I'm curious what kind of resin I can use that will be strong enough to hold up outdoors. I'm in the Pacific Northwest in a fairly temperate zone. Gets down to 12 every couple years. Lots of rain. Guessing these would hold about 200 gallons, so, the bottom would have to withstand 1400 lbs. I'm hoping pouring a 2 inch thick sheet would essentially cork the bottom (funnel shape, angled sides), create a perfect fit and then siliconing the edges top and bottom. I'm hoping this would create a strong pressure fit when the pot is filled with water. I would need the resin to be fish safe. Any input is appreciated!
....As far as the bottom of the funnel is concerned, I would do something as far as reinforcement goes. Multiple rods thru the bottom of the funnel, to give it the appearance of a grate, would be something that I would do. Think reinforcement rods that are used in bridge deck construction and you should get the idea. Resin is pretty tough stuff and should be resilient to the weather you have in you area. I prime and paint (seal) resin with no issues, so I don't see why a fish "safe" paint would not work.
The reinforcement is an interesting idea. The weight of the pot when it has water will always be on the ground and will be unmovable when full, the poured resin will be shaped like a cork, so, my hope was that the water would be unable to force it out. I'm curious to hear more of your reasoning.