fiberglassing a anchor box

avon5.4 · 04 October 2008, 19:13

hi ive a old searider and want to build a anchor box at the front so i can do away with the old barrel, ive pre cut the plywoog sheets to fit and are going to hold in place with pink grip then fiberglass the inside then screw a top on and fiberglass that so its sealed up then cut in the top a hatch lid so i can pull out the rope and replace the lid and use as a seat, whot materials do i need to do the job , i think its resin and hardener fiberglass mating or sheets is there owt alse or have i got these wrong.
cheers for any help,

doggypaddle · 04 October 2008, 20:46

I think i am correct in stating that polyester resin wont bond to wood well, i was thinking of making a locker for my SR5, what i was going to do was completley cover both sides of the wood with resin and tissue, then glass the encased wood into the boat, and flowcoat over the top.
You could use epoxy instead but its more expensive, but will bond to the wood. Either way you will need to key up the area you are bonding to for the resin to adhere.

ian parkes · 04 October 2008, 20:51

don't use pinkgrip unless its for a temporary fix

doggypaddle · 04 October 2008, 20:59

WTF is pink grip? sounds like its for holding dentures in

Is it like gripfill? Sikaflex may hold it in but i would rather epoxy it in.

ian parkes · 04 October 2008, 21:10

pinkgrip is another type of gripfill or no nails etc etc

Pete7 · 04 October 2008, 21:54

Have a chat to these people, they supply Osprey and and a few others in the trade, bt do a good little booklet on how to,

http://www.glasplies.co.uk/

Pete

Hampton Pete · 05 October 2008, 00:20

Quote:

Originally Posted by Pete7

Have a chat to these people, they supply Osprey and and a few others in the trade, bt do a good little booklet on how to,

http://www.glasplies.co.uk/

Pete

Just look on you tube......grp resin....loads of vids showing you how.

Hampton Pete · 05 October 2008, 00:22

Quote:

Originally Posted by Pete7

Have a chat to these people, they supply Osprey and and a few others in the trade, bt do a good little booklet on how to,

http://www.glasplies.co.uk/

Pete

sorry pete...did not mean to quote you...wrong button.

avon5.4 · 13 October 2008, 17:55

just been to a boat jumble and got some glass matting but the epoxy resin was too expensive for just a small job on my rib, how long would the normal resin last compaired to the exoxy resin. its only to make a anchor box at the front of rib i dont want a expert job finish.its a old rib and not worth that much spending on it.the plastic bucket does just as good a job. cheers andy

doggypaddle · 13 October 2008, 19:05

as long as you dont expect any great mechanical strength from the wood to resin bond polyester will be fine. IE encase the wood completley in matt then glass in.
or paint the wood with some west systems epoxy as a "primer" then just glass it in with the polyester resin.
a small west systemsis kit, enough to use as a primer is about a tenner.

ian parkes · 13 October 2008, 20:37

Andy what about an anchor bag .
I got fed up with a bucket but did like the way a rope easily flakes into it .
I found an Arborists rope bag on ebay and its great , I just clip the top of it to the ropes on top of the tube in the bow and the rope in the bottom of bag makes a great shock absorber to stop the anchor damaging things .
If i have kit bags in the bow then the anchor bag gets clipped somewhere else so its easy to get at without moving all the bags . Cost me £12

r mcdonald · 14 October 2008, 10:47

If you are concerned with using polyester resin, your searider is made of it and the deck and transom are ply wood.
As long as the fibreglass surface is roughened with sandpaper then cleaned with acetone before glassing you shouldn't have too much problem. Epoxy does stick better but it is not really necessary.
Any good fibreglass supplier should be able to steer you wright.
regard
rm

r mcdonald · 14 October 2008, 10:54

Quote:

Originally Posted by doggypaddle

as long as you dont expect any great mechanical strength from the wood to resin bond polyester will be fine. IE encase the wood completley in matt then glass in.
or paint the wood with some west systems epoxy as a "primer" then just glass it in with the polyester resin.
a small west systemsis kit, enough to use as a primer is about a tenner.

Polyester resin won't stick to epoxy resin very well. But epoxy will stick to polyester resin really well.
rm

avon5.4 · 14 October 2008, 17:25

thanks for that i can now go and buy some resin and i think i will need a lot as the matting we got was 1800 gramms or something like that, and will take a lot to soak in properly.

r mcdonald · 15 October 2008, 11:36

1800grams of glass will need about 4.5 litres of resin using 2.5:1 resin to glass ratio.
I am presuming one square metre of chop strand mat (CSM). Just weigh the glass you are going to use an multiply the weight by 2.5 and that is how many litres you need.
You will need to round any sharp corners , prime the wood with a coat of resin first so when you apply the glass, the resin doesn't soak into the wood and starve the glass of resin. A glass roller will come in handy for consolidating the resin into the glass.
I miss my searider.
rm

Ian M · 15 October 2008, 12:35

If you are concerned about the bond strength of polyester resin to the marine ply that you are using, paint the ply with G4. This is a lot thinner the resin but has a similar composition to resin. So it soaks well into the wood and also provides a good bond to the fibreglass. Apply the fibreglass before the G4 has completely dried.
I have done it this way myself and the bond strength is very good.