2-part foam? Anyone use it?

[Vortech C5]

Hi guys,

I am building a H&M 37" hydro. Awesome boat but its like a credit card. There is no way I can stick foam in the front. Its just too narrow. The pour style foam would be great but I have never used it. I spent a small fortune on the hull and don't want to risk any damage or strain. How do you use the stuff? I know OSE sells it. Thanks for any/all tips!

Ray

[SirBudman32]

I used the two part in the front of my UL-1, just did small pours and let it set for a day between pours so as to not get to much at once. Hope that helps.

[Vortech C5]

I used the two part in the front of my UL-1, just did small pours and let it set for a day between pours so as to not get to much at once. Hope that helps.

Awesome suggestion. Thank you!!! Do you mix it in a cup first and pour it in? What is your technique? How do I know the amount? Thanks again!

[MAMBA2200]

im getting ready to do this in my df33 think i will do this in 1oz at a time

[Basstronics]

I put way to much in my Pursuit. The stuff is heavy if you use to much.

Still gotta core drill my hull... lol

[MAMBA2200]

ive never used it so i must ask do you mix b4 pouring or what ?

[damfurst]

I use 2 part foam in all my builds from Aeromarine. The type I use fully cures in 20 minutes or less. As long as you have an opening for the foam to expand into it will not damage the hull. You have about 2-3 minutes to mix it throughly and then pour into your space. It will produce a little bit of heat but will not damage the hull. You can expirment with the amount by starting small and then adjusting it up or down acording to how much foam you want to put in the boat. Get the light denisty (as opposed to the high (heavy) density) The flotation will work just the same. You can do multiple pours in the same day with this stuff. I always waited for the first one to cool.

[MAMBA2200]

thanks for the info

[Cooper]

If anybody uses the closed cell foam in can form, just slip some tubeing onto the nozzle. That will get you to start at the farthest point getting it in the tightest spots.

[tlandauer]

In order to ensure exact measurement and ease of repeating the process, I use two of these :http://www.offshoreelectrics.com/pro...od=dh-gpmr8056. One for Part A and one for Part B, just measure the same amount and pour the contents from these two cups into a larger measuring cup. Then mix. I used clear plastic throw-away cups from super market. As the above post says, you have a short time.
For a total 1 oz. pour, measure 0.5 oz Part A and 0.5 oz part B, since you are using separate cups and the chemicals don't touch, you can re-use them for subsequent pours.
Make sure you mark which cup is used for which part. The larger cup is a different story ( throw-away item). Kintec sells a larger measure cup with beaker, http://kintecracing.com/Building_Supplies.html. Should make it easier for the MIXED pour.
BTW, It is important that ambient temp is at least 70+ F, search and you will find a thread regarding this issue. It has to do with making sure that the foam expands fully before your subsequent pours.

[i2oadsweepei2]

My friends and myself have been using evercoat 2 part marine foam. We've filled about 8-9 boats so far. It's a 1:1 mix. It mixes very well in about 20 seconds using about 30mls of each part. You need to get it poured very quickly once it is mixed to a solid colour. There has been no bulging of any kind. It adheres well to the inside of the hull too. We sometimes set the two evercoat containers in warm water for about 15 minutes and warm up the hulls with a hair dryer or place it over a register to warm it up first to get the best expansion. The first boat I filled was my spartan after removing the factory styrofoam. Even being plastic there was no bulging. It's available locally here near Toronto. Good luck. http://www.evercoat.com/productDetail.aspx?pID=165

P.S. When it's done expanding there is usually a gap around the highest part. I was scared at first to try and fill these little gaps for fear of deforming the hull. Being a spartan I didn't worry about it too much :) J/K... It filled the small gaps too with no problems. When topping up you can move the hull around and get it to flow where you want within the first minute. After that I wouldn't move it.

[jcald2000]

Here is what I use in all my boats for years, it is also used in the full size boats.
Heat for 15 min's in hot tap water, measure, stir for 20 sec's fast and pour.

http://www.uscomposites.com/foam.html

[i2oadsweepei2]

Here is what I use in all my boats for years, it is also used in the full size boats.
Heat for 15 min's in hot tap water, measure, stir for 20 sec's fast and pour.

http://www.uscomposites.com/foam.html

That is a great price!! We are paying about $76 + tax for a 2lb kit here.

[HTVboats]

I hate to be the down side here but foam does have some drawbacks. I started using foam years ago as flotation in the manufacture of full size boats. I have also used it in many models. Foam offers some n structural reinforcement but can shrink with the heat of the sun and warp a deck or hull. It also absorbs moisture. Yes it is closed cell but those cells break with vibration and impacts. Water is trapped in the hull and vapors permiate tha foam. I had a gas cat we pour foamed the sponson tips and over a year it started hooking in turns no matter what we did to offset the weight. The cure was digging out all the foam with long rods and hacksaw blades. Weighed the pieces and what went in as 2 oz. gained over a pound of water. I will never put foam in sponsons again. I like pool noodles and ping pong balls siliconed or glued in. Pool noodles jammed in can also be taken back out to dry things out.
Mic

[i2oadsweepei2]

Hi HTV, after I run for the day I usually leave the lid off and tilt the boat so anything inside runs back to the transom and soak it up with paper towel. For the most part though luckily my boats don't take on any water (knocks on wood). Would this help extend the life of the foam? Other than the heat from the sun being a factor? Thanks for any tips.