Reshaping the bottom

General Discussion
1

I’ve got this board with a flat (very slight convex) bottom, and I would like some advice for reshaping some concave into the bottom.

 

How should I approach this?

-Should I just take the sander to it and sand the new bottom contour through the glass and into the foam?

-Should I score the glass and peel it off the bottom and reshape from there?

-Is there another apporach I have not thought of?

 

Please, don’t tell me to make another board… This is an experiment, and I want to make this one change to the board.

 

Thanks!

2

I think skinning it would be the way to go

but,,,,,,,,,

3

You really need to see what you're doing.

If it was me I'd be marking out where you want the concave in pencil making sure it's even both sides of the stringer.

Considering it's got a slightly convex bottom, you'll need to mark right to the rails to get the concave you need.

Take a good hard look at it and think about how it would travel throught the water, is it going to work? Could I test out my concave therory on another board?

When you have decided to do it, get the sander out.....

cheers

4

 

but… what?

5

 

I know how I want the bottom contour to look, and I originally made the board with the idea of modifying the bottom later… and now that it is time to hack it up, I am looking for the best approach.

6

but,,, whatever way works for you will be the best approch

 

the differance btween convex to concave is what will determin how to go about it, and tools and skills.

 

maybe you could just build up resin , then resand the bottom if its a minor tweek  but there will be a little added weight.

just a thought,

 

got any pics?

1 Like
7

If your doing fin systems then you have to do two pieces of cloth on your tail anyway so cut the whole tail area out (without cutting into the foam) in the shape of a normal tail patch (unless you want your concave’s to go farther up then cut bigger)but make your cuts nice and strait on the bottom so the fix will look clean.  Then shape your concave’s. Next throw your first layer of cloth down in the shape of what you cut out so it’s now close to flush, then do a second layer with some overlap on the rails and bottom. Blend/sand the overlaps as smooth as possible without sanding them away and then do a whole bottom hot coat. That will give you your best shot at getting a nice smooth bottom. And if you make your cuts clean across the bottom in the end it will just look like a tail patch and not a repair.    (In my opinion)