43 replies to this topic
Posted 16 December 2007 - 10:09 PM
16 lb foam has a density of 16 lbs per cubic foot. not sure where to find it but a comparable wood would have the same density. the problem is that wood and foam have other properties such that 16 lb foam does not act the same as 16 lb wood. I myself havent tried foam yet and prefer to continue using wood.
Posted 16 December 2007 - 11:36 PM
Can you tell me a commercial lure that is made from this type of foam? I would just like to get a sense of this matterial in action.
PS: The St. L lambs are PO'd about the Packer crowd, colors, cheering during the game at Lambeau South - can you believe all the time taken went Brett beat another of Dan's records... Go Packers!!! Usher, give me back my "medicine"....
Posted 17 December 2007 - 08:45 AM
I don't believe any commercial lures are made from it. I found it quite durable and it performed well. The downside is that it is messy and can, at times expand differently based on temp/humidity.
Your best bet would be going to Urethane resin and micro balloons.
Posted 17 December 2007 - 09:38 AM
Thanks for the info... Like Vodkaman said, this is educational. Would the Urethane resin and micro balloons be as temperture sensitive as the 16 lb expanding foam?
It's about 20 degrees F outside.
Posted 17 December 2007 - 10:43 AM
Husky, you sound like you have given up with the foam! I only got to play with it for a few days before I moved to Malaysia. I wish I had brought it with me. I experienced the variations in expansion. It seemed to be relative to how much airation was introduced in the mixing stage. I would imagine temperature would have a profound affect also. I did learn that Plaster of Paris was not the mould material, every attempt was a disaster. Now I have RTV and no foam!
I have done some experiments with the resin (50%) and air in a mould and rotating until the resin goes off. This leaves a centrally located bubble to provide the buoyancy required.
I did not succeed totally, as turning the mould by hand was inconsistant. I estimate that one rev per second would do it. Unfortunately, I don't have the equipment to test this out. The resin 'goes off' from liquid to rubbery in just a few seconds, this is the reason for the speed. Testing with even higher speeds may be necessary.
Has anyone tried this technique? If not, I invite one of you to have a go and report. It may be a while before I am in a position to test the method.
Posted 17 December 2007 - 11:39 AM
Husky don't give up on foam yet.
Here's something from Nishine Lure Works to inspire you. I don't believe their claim on N-Foam lol, Foam is foam but maybe they have some extra additive. Foams I gets here are of the kind that u vary their mix ration to get diff density, so the potential is definately still there.
There is a well know company in US that uses foam too but have since been sold. THe name escapes me for now. (signs of inhaling too much lacquer and saw dust? )
Posted 17 December 2007 - 12:12 PM
i'm not sure if this helps...
i also use foam for big/heavy pike lures (thx for teaching me Husky ). the polyurethan foam i'm using is hard and buoyant, so if i want to make the bait heavy (i.e. sinking) i just put some lead in it. the expansion rate of the foam is 1:17 (1 liter will be enough for a lot of lures). the exact mixing ratio of the components (a+ is crucial. the "resin" is very liquid so i have never experianced any problems with airbubbles. pot life is very short! 90 seconds and the reaction begins to start. demolding after 270 seconds. i made the "casting channel" a bit larger to gain some time while casting due to the short pot life. the surface of the bait comes out of the mold very smooth. i never managed to get a good result with putty molds (even with mold release), so i'm using rtv-silikone.
Posted 17 December 2007 - 01:55 PM
Suddeth crankbaits (now extinct?) were made from foam and had a good reputation. You could order the baits floating or sinking. Cheesehead, I would think 2 materials of the same density would behave identically as far as action, need for ballast, etc. What properties of foam didn't you like? 16 lb/cu ft is higher than balsa but less than most hardwoods.. close to paulownia at 18 lb/cu ft. I wonder how variable the density of 16 lb/cu ft foam is, depending on temp, handling, mixing, etc?
Posted 17 December 2007 - 02:33 PM
I am coming in late here and have not read all of this topic, so if I am off track please excuse me. In a past life and in my youth, I used to make surf boards with foam. to get a higher density in the foam, excess foam mixture was prepared and then blended was quickly poured into the mould. These moulds were concrete and sealed with a series of clamps around the joint. The foam would expand at the normal rate , but because the volume was confined it would be compressed to a very strong dense but still boyant foam. pete
Posted 17 December 2007 - 04:06 PM
I just pored a bunch 16lb foam swimbaits this weekend for the first time and they are ready for paint. what is the best base coat before I airbrush with Creatix and seal with devcon ?
Posted 17 December 2007 - 04:37 PM
WASH them with warm soapy water to assure all MR is removed. I dip them in Propionate to get a smooth base coat.
Posted 17 December 2007 - 04:58 PM
So after I apply Propionate I can just start layering creatix? no primer?
This may sound Dumb but what is Propionate and where can I get some?
Has anyone use a plastic primer as a base coat?
Posted 17 December 2007 - 06:54 PM
Posted 17 December 2007 - 07:52 PM
I plan to use POLYWOOD for pouring my line of KOMMA KOZZY KRANKZ
Have any of you guys used this product?
What do you think of it?
PolyWood™ is a rapid set casting compound filled with silicate glass bead (microballoons). It offers, lightweight, good strength and low 0.53 density. PolyWood™ is easily machined, sanded or carved and resists heat to 140°F. It is excellent for casting rigid, non-absorbing, deep water floatation devices or syntactic foam parts. At great depths (high pressure) PolyWood™ maintains buoyancy and resists compression (we also offer a neutral buoyancy flexible urethane)
Posted 17 December 2007 - 08:46 PM
Hawg. I tried the polywood several years ago and had problems with it curing. The tech staff told me that my problem may be that I was trying to mold too narrow of a part and these were 7" long by 7/8" diameter cylinder type muskie lures. I did not have that problem with featherlite or 16#foam in the same mold. Seemed like tough stuff if you could get it to cure right, but too spotty for me.
Posted 18 December 2007 - 10:44 AM
Looks like I have a lot of reading to do .