When i started my resto project i had no idea how to put my transom in so i did what i thought was a good job. However i have voids between the transom and the outer skin. can anyone tell me how i should go about filling in the voids? Is there a real chance of seperation? My boat is a 73 Newman CH. What I did to put in the transom was to put CSM on the transom then a few days later i sanded it down and put a lot of resign on the transom and the skin of the boat. Then i put plywood on both side of the transom and clamped it in the best I could. Before i found the voids i had already replaced the floor so pulling the transom back out is not not really an option. By the way if any one ask foam can really blow your floor out, atleast part of the way out anyway. So as you can see i have made my fair share of mistakes. Before I started this project i had never seen or heard of anyone rebuilding a boat so all this is new to me.
Its an outboard and the biggest void is right where the motor will mount. The big one is 6 inches round 2 are about 4 inches and on the outer top edges and a 2 about 1 inch round as best i can tell. I have some pics and will try to post them as soon as i can.
First thing is to outline your voids with a crayon or maker.
Next is to drill 2 small holes ( about 1/8 " ). One at the bottom of the void and one at the top.
Mix up some fast cure epoxy and inject it using a plastic syringe ( with the nose cut off to Perfectly fit the hole ). Inject the epoxy until it starts to overflow out the top hole.
Wipe up any runs that comes out.
Those smaller ones..hmm.. Not sure if I would go after them right now.
I used a resign from Lowes to put in the transom and found it to be to thick. I have switched over to aero marine epoxy with no VOC's. it is realy thin should I thicken it up? Will it be a problem since it is not the same? the one from lowes does not say what kind of resign it is.
Well i started filling the voids and apparantly when i clamped the transom in i did a verry bad jod resign started coming out of holes in the bottom of the transom outer skin that was already there and i started filling about three quarters of the way up. My guestion is what to do now? Do i just keep tring to fill the voids? Because at the bottom of the wood inside of the boat are big voids between the wood and the outer skin. Should i put an aluminum plate on the back and bolt it throught the transom to pull it all together? I have already put the floor in the boat so pulling the transom back out is not something i am willing to do right now. I have put to much time and money to have to pull the transom back out and mess up all i have done. There must be something i can do even if it is not exactly the right way? Any suggestions would be appreciated. Thank you
Since you did not use Thickened resin (Peanut Butter) to fill the inevitable voids when installing a transom it will be almost impossible to find and fill all the voids between the outer skin and the wood transom. The ONLY way I know would be Just like YD suggested. It should be noted that the transom is likely to delaminate from the outer skin in then near future when put under stress by the motor and the wakes and waves you are sure to encounter when on the lake. I my opinion you should at the very least remove a portion of the rear deck and redo the transom the correct way. If not I fear the transom is doomed for failure. Just my opinon. It's your boat so you can do as you see fit.
there are several threads on clamping....i think woodie has diagrammes.
in every transom i do .....i also use any thru bolt holes like the tow hooks.....i pre fit, and pre drill the holes.
then i coat bolts and washers with pva, and when in install a transom i bolt the thing in to the boat.
then clamp for out boards. inboards, i use a different method......that is in the link in my sig
The Hull Extension Thread
great info on all aspects on boat building with detailed information.
Your clamping was not so much the issue as the fact that you did not use thickened resin. A transom skin is seldom flat and you need the thickened resin to "fill the voids". Using regular resin will do two negaive things. One the resin will not stay put and flow off both the skin and the wood and two will not fill voids. You need to put about a 1/4" thick layer of Thickened Resin on both the wood transom and the outer skin and then clamp them together using "Medium" pressure to squeeze out the resin but not all of it. this ensures the voids are filleds and good adhesion is accomplished. Check the link in my signature for drawings on what I have just described.
Thank you. Ok here we go. I pulled about 10 inched of the floor out. Then i pulled the transom and i be dang if the transom did not come out in one piece. Since it is none the worse for ware i will reinstall it. Thank you all for telling me pull it back out because it was held in by three spots that bonded. Can anyone explain to me how to put the stringer back in since i had to cut it of to get it out. I will try to post pics tomorrow if that will help. The stringer is made out of a 2 x 4 and i have not seen anyone put a stringer in like the stringers i have.
You will need to "Sister" it back in. That means Butt joint a piece and then add two pieces of 1/2" ply wood on either side of the stringer using epoxy and screws. Then Glass over all of it. You still have to figure out a way to clamp it properly. Have you got that figured out yet? Is the top cap back on your boat? Do you have the material to make your Peanut Butter thickened resin?
Ok i will sister them. I have not figured out the clamping issue yet. the top is still off. I do have the stuff to make peant butter. I have made it a few times so far and i am still tring to get the hang of it.
Did you tab in the transom to the sides of the hull?
From your statement above it was only holding in 3 spots sounds like you didn't.
Take a good look at Woodonglass link (Fabricating Decks, Stringers, and Transoms) in his signature.
This shows how to do it right.
Get some pics up.
Just when I thought I was really learning, I continue to find out how little I really know.
I had it tabbed in i was refering to the wood and the back boat skin only sticking in three spots. I hatted to have to remove all that tabbing but like i said I screwed it up.
I am using cabasile and 1/4 chopped strand with aeromarine epxoy. I tell you what when that PB dries that is some strong stuff. I had some left in the buchet so i put a stick in it and let dry for about a week pulled it out and beat the heack out of it on the concrete and did not even dent it.