Disaster has struck...
I applied putty to the thermocol hull which was covered with tissue paper...
The putty is eating away the thermocol...
Hull shape is ruined...
I am regretting the decision I made to do this type of a hull build...

 

Someone please help and tell me what to do? 

Don't use tissue paper...use news paper ... It vl work.
Cover with news paper and apply favicol on It .. and let It dry.. and then apply putty..

First I tried using news paper... It was not even sticking to it...
I have wasted half kg of putty...
I have applied putty after 3 day of putting tissue paper...
Have you done any build in this manner with thermocol?

Please post some pics...

Yes had did these method that's why I am tell you..
First apply fevicol  on thermocol.. and yeah mixed some water with fevicol and make It dilute..
Then apply news paper on it ... And again apply fevicol on new paper...and thn keep It for drying.. and then apply putty on it.

I did the same thing with tissue...probably tissue paper is very porous

This hull RIP...
Is anyone selling balsa kits?? similar size and type?

I have a boat... Which I want sell .. if u want then tell

I don't want a boat... I want to BUILD a boat...

I am not disheartened... Again started with a smaller speedboat... 500mm length 200mm width
Option 1:
I guess I'll shape the boat hull and use it as a plug for fiberglassing (I'll get that done at a workshop) after coating it with Plaster of Paris and sanding it to perfect shape...

Option 2:
I will shape the hull and then apply resin directly on the hull without any fibreglass cloth...

First, its time to make the hull crude shape and then I'll sand it into shape...

I have doubt which always kept me away from making boat! The doubt is how will I increase the shaft of the motor, I have brushless motor ! And second is if I make a hole for the shaft then water will come in the hull then how does it work?? Help please!

The shaft does not directly go out of the hull. . It is the stuffing tube that goes out. . It is filled up with grease and the shaft rotates in the stuffing tube. The motor shaft is coupled to the prop shaft with a coupler

I've seen a jugaad at Chilika Lake in Orissa...

THe motor is not fixed... It is movable and the prop shaft is entirely above water...
No need for stuffing box...

The culprit for the hull being ruined was the thinner...
As soon as the thinner came into contact with thermocol, a vigourous reaction started between the acetone of the thinner and the styrene of the thermocol... The product was a sort of substance that felt like it was a chewed piece of chewing gum kept in a deep freezer...
It was and endothermic reaction with accompanied with decrease in volume... after a time of 20 seconds, the reactants and products came into chemical equilibrium...
Now what is K_c of the reaction???

I've been studying a lot of chemistry these days so it got stuck into my head...

lol chemistry mixed with  rc
what a RCocktail......

Todays progress... afte half an hour of scolding for the mess I made...  

I have sanded the hull into precise shape...

Point of decision...
What should I do next?

Option 1: I have to make a plug and give it to fibreglass workshop for making a fibreglass hull... ( This can be done many a times if one hull goes wrong or if someone else also wants the same hull...)

Option 2: I have to apply fibreglass resin without fibreglass cloth directly on the thermocol hull...

Experts please give your opinion...

with your option 2, i guess the resin will eat ur termacol.

No it won't 

Actually  it depends on what resin you will be  using.. I used an unbranded one available  in local  market  works fine... Just that it has a very  short  setting time  got to b quick

Just resin would be good enough.

Quote from: docnayeem on June 15, 2014, 06:44:36 PM
No it won't 

Actually  it depends on what resin you will be  using.. I used an unbranded one available  in local  market  works fine... Just that it has a very  short  setting time  got to b quick

The FG resin I get locally eats up Thermocol. What's your resin called, any specific name or application?

Quote from: topalle on June 08, 2014, 03:49:50 PM
First I tried using news paper... It was not even sticking to it...
I have wasted half kg of putty...

Polyester putty sticks to newspaper very well. Rough up the surface with a 300-400 grit sandpaper prior to putty coat, maybe?

I used less than 100g of putty for a 700mm DeepVee and a 550mm hydro combined and VC sir told me even that is too much, why did you want 1/2kg?  

 I tried to fill up the uneven surfaces...
It was a 1000 mm boat

It wan't polyester putty...
It was nitrocellulose putty...

really awesome boat it would be