Foam mold making
20 replies to this topic
Posted 29 January 2007 - 01:02 PM
New... I have been trring to sort out the old post.. Looks like making a lure out of foam can be neat. I have seen that bondo was used for a two part mold. Saw that the way to go was a RTV mold. Can someone give me the up to date method for making a mold. Is there a book that has become this sites bible for mold making... any recomendations for a book.. recent post.
Posted 29 January 2007 - 09:19 PM
Thanks Husky, Have you used Bondo to make a mold and poured foam in it as well? If so is the rtv the best? Trying to narrow down what I need and the suppliers. I've got a lot of research to do. Do you have a favorite lure making book that talks about mold making? Thanks Skeeter Jones.
Posted 29 January 2007 - 10:17 PM
RTV is the best. Bondo or durhams rock puddy can also be used. The RTV will churn out a lot more baits and is more forgiving. With the bondo and rock puddy care must be taken not to let the foam set up too long and attention to crankbait design more critical. Don't want to design a crank that will effectively lock itself into the mold do to undercuts for example (RTV no problem but reduces life of the mold in my experience). Mold release a must on bondo and rock puddy.
Posted 29 January 2007 - 10:18 PM
Husky, Tried a hyper link to shopmanic.com could not get it to come up, saw another post on foam and found your link for US composite.. Saw the 16# foam, What RTV do you use to make the mold. I also noticed you did not use guide pins , saw on the picture some indentions... how did you make them .
Posted 29 January 2007 - 11:54 PM
Travis, thanks for the info.. Here is another ??? I read that someone made his own plastic coat out of Laquer and melted plastic cups. (The coating put on after you pull the lure out of the mold). Is there a product pre-made for this and who is the supplier.
Posted 30 January 2007 - 09:41 AM
The key with finishing any lure you cast, is to make sure you remove every trace of mold release. I wipe mine down with alcohol and was them in really hot soapy water, then thoroughly rinse with hot water.
I like to base coat with a dip of disolved plastic. The Bottom one received a few dips.
Tally made a tutorial on how to make the stuff. Propionate Pellets are better than cups and are available on Ebay or through Swede.
I use flat head nails as my guide pins. I insert them appx. 1/2" into the clay prior to pouring the first half and make sure I cover the heads with atleast 1/2" of whatever Material I'm using to make the mold from.
Here's a pictue of a Bondo Mold I made for Jig Heads.
I get perfect alignment everytime and I'm able to put the halves together w/o distutbing the weights and harnesses I'm casting into the castings.
I've used the hard urethane rubber, shore hardness 80 with good results. The Tin Sil Silicone looks to be a good product.
Here's an early Poes mold w/o locating pins. The material is Urethane rubber, Shore 80 hardness.
As Travis said, you can get good results from rigid (Bondo, etc) molds, but the molds must be perfect. w/o any undercuts. The Softer mor flexible rubbers allow for some margin of error, although I must say, you should strive for perfection in any even.
Freemans Tutorials are very informative and they make it look easy.
Posted 30 January 2007 - 12:44 PM
Found someone who knows his stuff, Thanks for the answers Husky. What is the ratio of pellets(Propionate) to laquer?
Posted 30 January 2007 - 12:57 PM
I just mix it until it slightly more than whole milk like. There are guys here who Have been using it for a lot longer than me. I was using plastic utensil for a few years. Use the Search function for more info on it.
Posted 30 January 2007 - 03:12 PM
Can you Email it to me too?
thanks in advance,
Posted 07 February 2007 - 11:18 AM
I tried to make a dip using some 9oz crystal clear Solo cups and acetone.. They did not melt. Do you have to use virgin laqure thinner with the solo cups. Reaserching the pellets I found there are all types. What is the base ingredient styrene,polycarbonite....??? I am trying to keep the cost down while I'm learning
Posted 07 February 2007 - 12:12 PM
This has been up so many times before but here we go
when using solo or other cups use virgin lacquer thinner only!!
acetone doesnt work with the cups. Theres no shortcuts using this technicue
If you use propionate pellets like i do you can use either
virgin lacquer thinner or acetone .I myself prefer acetone
Why? Less odors &cures harder if you ask me .
search on theese words (plastic dip, plasti dip ,plastic cups , propionate pellets )
Posted 07 February 2007 - 08:46 PM
Hi guys!!The tutorial from artbrush was much better then that japan one!!!A lot more details and it work very very nice!!!Hey art!You sould repost that rtv mold tutorial??Could help a lot of guys here!!Sure help me a lot when I did mine!!!!
Posted 08 February 2007 - 12:35 AM
Holy Too Many Thumbnails Batman!! THE MOLD IN THE PIC IS COLEY'S. Sorry, EC, I pulled that Pic out of the vault, thinking it was a Poe Mold I'd made. No slight intended. I thought it was this one;
I'm editing the other post, right now. (TOO late, the edit function is no longer available.)
Posted 08 February 2007 - 11:02 AM
So you then stick the nozzle of the foam can in the hole?What is your foam of choice?
Posted 08 February 2007 - 01:01 PM
Brave viper, The foam they use comes in a two part mix, not an aresol can. It is the 16 lb (strength) foam. There are a couple of post that has a link to the companies. Search this site using key word "Foam" and you will get some answers. I'm new too..
Thanks swede for answering the question on acteone and virgin lacquer.