Re: Here We Go Again
 

I've heard of the air compression trick. I guess thats how the pro's do it. I've got one more mold to build and maybe I'll try it on that one. I'll make sure I have Tim standing by to catch the part on it's way down. :D

Ed- that coffin box for the fuel tank was a big mold! Glad to hear that it worked for you. I've never used the PVA before so if I get you right it's sprayed on after the wax? I think what happened on this one was the duratec must have bled through the wax slightly and stuck to the iso polyurathane.

I sanded on the bracket for about 45 minutes this evening after work and it's cleaning up very nicely. Not as bad as I thought it was going to be. I have 4 of the sides looking good. The problem is going to be finding time this week to work on it. I don't know what it weighs but I will get a weight on it at some point. It feels nice and light however.

strick

Re: Here We Go Again
 

Are you still using the vinylester resins for the brackets??

What you think of as your mistakes are still awesome work... :cool: You have the kahunas to jump into it, the persistence to make it right, and the imagination to think of it in the first place.

Re: Here We Go Again
 

3 coats wax and buff each coat with a rag like your waxing a car then spray 2 coats of PVA allowing each coat to have some dry time. aprox 20 to 30min between coats.

Re: Here We Go Again
 

Thanks Bobby.

The bracket is made with iso-polyester resin. I'm pretty much done with glassing stuff inside the boat. So for making parts I'm using the polyester. There is a lot of sanding, fairing and primering left to do to the boat inside and out.

First round of sanding and system 3 for the bracket. I will have to sand one more time and then another smaller round with the system 3 and it will be ready for primer. Hopefully if I get a couple hours this week I might be able to make the mold for the swim platform.

http://www.casdvm.com/photos/20sf/DSCN6526.JPG http://www.casdvm.com/photos/20sf/DSCN6528.JPG http://www.casdvm.com/photos/20sf/DSCN6529.JPG http://www.casdvm.com/photos/20sf/DSCN6530.JPG http://www.casdvm.com/photos/20sf/DSCN6531.JPG http://www.casdvm.com/photos/20sf/DSCN6533.JPG


strick

Re: Here We Go Again
 

Do you wet out your mold with ISO before you wax and Duratec?

Re: Here We Go Again
 

Yes that what I did on this one but I wont do it that way again. On my next mold I'll either wax strait over the MDF (mold) and then PVA or I'll put down 2 coats of epoxy then wax and PVA over that.

strick

Re: Here We Go Again
 

did you use polyurethane or iso-polyester ? above you said polyurethane, just wondering.

Jeremy

Re: Here We Go Again
 

Gerbil - It's ISO - Polyester resin . . . from compositesone. It's great resin to work with

Re: Here We Go Again
 

What Big said, I must have still been high from the fumes when I wrote that :D

strick

Re: Here We Go Again
 

Well I would have rather been at the gathering in Florida but since I live 3000 miles away I elected to stay home and grind fiberglass.

Finally got the boat off the trailer. Perry is a client of mine who owns a recking company. Lifting a 20 foot boat off the trailer is easy work for him. We traded services....I did a dental on one of his horses and he lifted the boat onto blocks for me. Now I can get to the bottom.

http://www.casdvm.com/photos/20sf/DSCN6541.JPG http://www.casdvm.com/photos/20sf/DSCN6542.JPG http://www.casdvm.com/photos/20sf/DSCN6543.JPG http://www.casdvm.com/photos/20sf/DSCN6544.JPG http://www.casdvm.com/photos/20sf/DSCN6545.JPG

The inside of the bracket is coated with white epoxy paint. Note the limber holes in the stringers.

http://www.casdvm.com/photos/20sf/DSCN6547.JPG http://www.casdvm.com/photos/20sf/DSCN6549.JPG


Mold for swim platform

http://www.casdvm.com/photos/20sf/DSCN6550.JPG http://www.casdvm.com/photos/20sf/DSCN6553.JPG http://www.casdvm.com/photos/20sf/DSCN6554.JPG

Two heavy coats of wax and 2 coats of PVA (thanks Bobby for the tip on the Preval sprayer) I was taking no chances this time around.

http://www.casdvm.com/photos/20sf/DSCN6555.JPG

duratec applied

http://www.casdvm.com/photos/20sf/DSCN6556.JPG http://www.casdvm.com/photos/20sf/DSCN6557.JPG http://www.casdvm.com/photos/20sf/DSCN6559.JPG

lay up complete. It has 3 layers of 2 ounce matt and three layers of 1708, The corners and edges are beefed up with more glass.

http://www.casdvm.com/photos/20sf/DSCN6560.JPG

Foam coring added. It is cabosiled in place and then glassed over with 2 layers of 1708.

http://www.casdvm.com/photos/20sf/DSCN6563.JPG http://www.casdvm.com/photos/20sf/DSCN6564.JPG http://www.casdvm.com/photos/20sf/DSCN6565.JPG

Proper clothing for grinding fiberglass

http://www.casdvm.com/photos/20sf/DSCN6570.JPG http://www.casdvm.com/photos/20sf/DSCN6574.JPG

This thing literally lifted right out of the mold. I did not even have to use a wedge to free it.

http://www.casdvm.com/photos/20sf/DSCN6578.JPG http://www.casdvm.com/photos/20sf/DSCN6582.JPG

There are some imperfections. I don't know how they got there because the mold was smooth. I'm thinking too much wax.

http://www.casdvm.com/photos/20sf/DSCN6586.JPG http://www.casdvm.com/photos/20sf/DSCN6589.JPG

Test fit

http://www.casdvm.com/photos/20sf/DSCN6591.JPG

cutting off excess glass

http://www.casdvm.com/photos/20sf/DSCN6599.JPG

It took several test fits and a little art work on the part with the grinder but we finally got it to fit perfect.

A heavy amount of Cabosil is added to all the contact points to ensure a good bond between the two parts.

http://www.casdvm.com/photos/20sf/DSCN6602.JPG http://www.casdvm.com/photos/20sf/DSCN6605.JPG

Clamps and weight's help to squish everything together.

http://www.casdvm.com/photos/20sf/DSCN6612.JPG http://www.casdvm.com/photos/20sf/DSCN6613.JPG

I have a litle help on sanding the bottom of the boat. It's not as bad as I thought. There are some areas of blistering but it is not as extensive as I had anticipated.

http://www.casdvm.com/photos/20sf/DSCN6621.JPG

Cuting a hole for the Armstrong hatch.

http://www.casdvm.com/photos/20sf/DSCN6622.JPG http://www.casdvm.com/photos/20sf/DSCN6625.JPG

I had to modify the ends of the grabber bar on the hatch so I could get it fit in the hole. I had to do the same thing on the hatch on my 23 3 years ago.

http://www.casdvm.com/photos/20sf/DSCN6624.JPG http://www.casdvm.com/photos/20sf/DSCN6627.JPG

It fits now

http://www.casdvm.com/photos/20sf/DSCN6626.JPG

System 3 quick fair is applied over the blemishes after a good sanding and several acetone baths. I hope to get it mounted by this weekend.

http://www.casdvm.com/photos/20sf/DSCN6663.JPG http://www.casdvm.com/photos/20sf/DSCN6664.JPG http://www.casdvm.com/photos/20sf/DSCN6665.JPG

strick