Reply
 
Thread Tools Search this Thread
 
Old 26 September 2003, 07:17   #1
Member
 
Country: UK - England
Town: Wickford, Essex
Boat name: Seahorse V
Make: Avon Searider
Length: 4
Engine: Mercury 50HP
Join Date: Jul 2003
Posts: 57
Gelcoat Application

Hi All,

I have decided to do a bit of maintenance work to my boat. When I bought it, although in fairly good condition, it has quite a few scratches on the under side.

I was told that the best way to make it look nice again is to use Gelcoat and spray it on. I have been looking up information on Gelcoat and it seems it is the right stuff but I have also heard rumours that it is not just a case of spraying it on like paint. Apparantly, there is a thing called the 'Orange Peel' effect.

Is this the best stuff to use to respray the bottom of the RIB. I intend to flatten the scratches with filler and there are a couple of holes I want to make disappear from things that were bolted into the RIB by the previous owner.

Can anyone give me some good advice either on using Gelcoat to do this or perhaps suggest and easier, economical and good alternative.

I will probably change the colour of it so will probably do the inside afterwards to make it all look nice.

You help would be much appreciated.

Steve.
__________________

__________________
slangley is offline   Reply With Quote
Old 26 September 2003, 12:32   #2
Member
 
Country: UK - England
Town: Haywards Heath
Join Date: Aug 2003
Posts: 2
Gelcoat (which is the outer, hard layer of any GRP moulding) is a thixotropic (thick and sticky) resin, so it doesn't run out of the mould during manufacture. Consequently, I don't think you could spray this onto your hull. The best way to refurbish any GRP hull is to fill any scratches, holes etc. with a suitable gelcoat filler, sand very smooth, then spray with a two-pack polyurethane paint. This stuff is very hardwearing (it's said to be harder than the original gelcoat) and very shiny. For this reason (and the fact that it gives off some very toxic vapour when sprayed), it's probably not a DIY job. If you get runs or brush/spray marks in it, it's very difficult to rub them out. However, there are approved application centres for the main brands (e.g., International, Awlgrip) where they have all the right equipment and will make a boat hull look like new.
__________________

__________________
MikeS is offline   Reply With Quote
Old 26 September 2003, 21:40   #3
Member
 
Country: UK - England
Town: Portsmouth
Boat name: Cracking Day
Make: Tohatsu
Length: 6m +
Engine: Optimax 150
Join Date: Aug 2003
Posts: 265
A lot of people use a small foam roller (not a fluffy one) to apply the gel coat. You can put two coats on, the last coat has another liquid added too called..cant think at the mo. It ensures the top coat isnt sticky. I did this to my boat, came up really nice, its a bit tought than 2k paint.
__________________
Tactical Paintball-Hampshire, Surrey and beyond!
www.crackingday.com
Andy Stevens is offline   Reply With Quote
Old 27 September 2003, 07:09   #4
Member
 
ribraff's Avatar
 
Country: UK - England
Town: Dartmouth
Length: 6m +
Join Date: Feb 2003
Posts: 1,210
Gelcoat

I have had very good results from spraying on crystic topcoat, it is available from Scott Bader. You will need to add pigment to get the colour you want and use acetone as a thinner. The good thing about this application is that if you do get any runs you can wet and dry them out and buffing with a 1000 grit and then a 1200 will give excellent results.
Spraying on gelcoat is a bit harder in my view but if you do go down this route you will need to add wax in styrene... this is what stops the top surface from being sticky
__________________
Hypalon Tubes built in-house,retubing, repairs, Accessories
www.ribtube.co.uk
ribraff is offline   Reply With Quote
Old 27 September 2003, 07:53   #5
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,962
Not wanting to discourage you in any way, but you will need to seriously abraid the whole of the hull surface if you intend to apply gelcoat. If you intend to paint it, 240 grit wet-or-dry will do fine. Don't use car body filler to make the hull good, it absorbs water.
To fill the holes, chamfer their edges and file them inside to give a key. Tease apart some chopped strand mat into a fluffy pile. Mix up some resin and stir in as much of the CSM as seems reasonable. Stuff this into the hole and stipple it with a brush to get rid of the air. You might like to seal one side of the hole with tape first. When it has hardened, file/rasp/grind it flush.
If applying gelcoat, it will set shiney (provided you use the paraffin wax in styrene, commonly called Solution"MW") but it won't be flat. If you use a foam roller to apply it, it will have a finish that is very orange peely. The finish will be better if you use 50% gel + 50% normal resin, but, nevertheless it won't be flat. If you use a short hair roller you'll get a much smoother surface but it will need to be thinly applied and it'll require a few coats but it will still have a texture. The solution "MW" MUST only be in the final coat or it will prevent subsequent coats adhering. Personally, I would want to sand it down afterwards and then go through a polishing process.
However, it is the case that a smooth matt surface produces less friction than a nice shiney one. You may be happy to consider this.
Finally, if the scratches are not too deep, gel coat will probably fill them without recourse to a filler.
__________________
JW.
jwalker is offline   Reply With Quote
Old 27 September 2003, 09:09   #6
Member
 
Country: UK - England
Town: Portsmouth
Boat name: Cracking Day
Make: Tohatsu
Length: 6m +
Engine: Optimax 150
Join Date: Aug 2003
Posts: 265
I didnt get any orange peel with the roller, laid it on a bit thick and it floated out.

Didnt mention the prep, if its not keyed it will fall off for sure!
__________________
Tactical Paintball-Hampshire, Surrey and beyond!
www.crackingday.com
Andy Stevens is offline   Reply With Quote
Old 27 September 2003, 12:34   #7
Member
 
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 4,962
Quote:
Originally posted by Andy Stevens
I didnt get any orange peel with the roller, laid it on a bit thick and it floated out.

OK.
__________________
JW.
jwalker is offline   Reply With Quote
Old 29 September 2003, 10:15   #8
Member
 
Country: UK - England
Town: Manchester - Abersoc
Boat name: MeMe
Make: SeaPro 595CC
Length: 6m +
Engine: Mercury 115 4S
Join Date: Jul 2003
Posts: 1,681
Send a message via MSN to MeMe
Can you wait

If you're not in a mad rush why not wait another couple of months and get a professional job done. Once the dealers have done all their winterizations and are kicking their heels as no one is buying new boats they still have to employ their mechanics and technicians and are often crying out for work just for the sake of keeping people busy. A quote received today can often be halved when there's snow on the ground !! If you get my drift.
__________________
Buy it & Use it, then sell it and buy something bigger
MeMe is offline   Reply With Quote
Old 29 September 2003, 11:48   #9
Member
 
Country: UK - England
Town: Wickford, Essex
Boat name: Seahorse V
Make: Avon Searider
Length: 4
Engine: Mercury 50HP
Join Date: Jul 2003
Posts: 57
I am not in a mad rush but would like to do it myself for the experience and satisfaction. If I mess it up I guess it is rub down and start again.

I have spoken to a few fibreglass companys that deal with this sort of thing and it seems the best way forward is to completely rub it down to get rid of the last wax surface and then apply with a roller, the last coat being with a wax solution added. Then rub it down until it is smooth.

Just as 'JWalker' said really. I have ordered up the stuff so I guess I will have a go. You never know, I might get lucky.
__________________
slangley is offline   Reply With Quote
Old 29 September 2003, 12:04   #10
Member
 
Country: UK - England
Town: SOUTHAMPTON
Boat name: Won't get Fooled Again
Make: Ribtec
Length: 6.5
Engine: Honda 130
Join Date: Mar 2002
Posts: 888
How old is your Hull?
__________________

__________________
I need a little bit of Rhythym and a little bit of Blues
thewavehumper is offline   Reply With Quote
Reply

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off





Copyright 2002- Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 15:44.


Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2017, vBulletin Solutions, Inc.