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20 April 2021, 15:57
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#1
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Member
Country: UK - Wales
Town: Llanfairfechan
Boat name: Labrax
Make: Quicksilver
Length: under 3m
Engine: Tohatsu 9.8
Join Date: Dec 2017
Posts: 95
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How should I repair this please?
When cleaning my RIB I noticed a chip in the base of the transom, right on the edge where it meets the underside of the hull.
I picked the loose bits out leaving the hole as shown in the photo. It is about 30mm wide and 7mm deep at the deepest point.
Not having experience of grp repairs, but seeing it as only small and superficial damage, I would like to fix it myself.
Would a gel coat repair kit be appropriate to do the job or do you have any better suggestions for me please?
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20 April 2021, 16:11
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#2
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Member
Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
Posts: 5,596
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Quote:
Originally Posted by Pecheur Anglais
....I would like to fix it myself.
Would a gel coat repair kit be appropriate to do the job?
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Yes. Plus some pigment to colour match the hull.
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JW.
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20 April 2021, 16:55
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#3
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Member
Country: UK - Scotland
Town: Aberdeenshire
Boat name: Sula
Make: Ribcraft 4.8m
Length: 4m +
Engine: Tohatsu 70hp + aux
MMSI: 235087213
Join Date: Jun 2007
Posts: 4,607
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Gel-coat and build up in layers given the depth. Once you've reached the desired level, 3M wet and dry sandpaper and go through the fine grit levels grit on a sanding block with a little Fairy Liquid to lube. That's the laborious bit, but will bring back a decent finish. Just keep rinsing the area and getting rid of the gel-coat residue. If you have a rotary mop with a foam pad, you can use Menzerna 203 or similar to polish up.
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Is that with or without VAT?
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20 April 2021, 17:05
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#4
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Member
Country: UK - England
Town: Wild West
Boat name: No Boat
Make: No Boat
Length: under 3m
Join Date: Jan 2008
Posts: 5,304
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Quote:
Originally Posted by spartacus
Gel-coat and build up in layers given the depth. Once you've reached the desired level, 3M wet and dry sandpaper and go through the fine grit levels grit on a sanding block with a little Fairy Liquid to lube. That's the laborious bit, but will bring back a decent finish. Just keep rinsing the area and getting rid of the gel-coat residue. If you have a rotary mop with a foam pad, you can use Menzerna 203 or similar to polish up.
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X2
All good advice you'll find a rubber sanding block (it'll help get a flat repair to match original surface) and some washing up liquid in the water for the wet and dry will help too.
You can buy white gel coat repair filler off the shelf
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A clever Man learns by his mistakes..
A Wise Man learns by other people's!
The Road to HELL ..is Paved with "Good inventions!"
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20 April 2021, 17:09
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#5
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Member
Country: UK - Wales
Town: Llanfairfechan
Boat name: Labrax
Make: Quicksilver
Length: under 3m
Engine: Tohatsu 9.8
Join Date: Dec 2017
Posts: 95
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Thanks jwalker, spartacus and Maximus.
That gives me the confidence to order some white gel coat and catalyst, then get stuck in. Fortunately I have all the other stuff mentioned already, apart from a rotary mop. Guessing that's not a problem as its only a small area to polish.
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20 April 2021, 17:52
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#6
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Member
Country: UK - Scotland
Town: north ayrshire
Boat name: charlie girl
Make: S/R5.4/regal3760
Length: 10m +
Engine: Suzukidf70 2x6lp 315
Join Date: Jul 2009
Posts: 3,927
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Remember you need to add wax to the final coat of gel coat or it will stay sticky & be a bugger to sand. Gelcoat filler will be different & should go off alternatively if your using gelcoat you can cover with brown packing tape to make it go off.
Gelcoat is designed to stay sticky to adhere to subsequent layers of glass & resin, to get a full cure you need to either add wax or cover it to exclude the air to cure fully
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20 April 2021, 20:46
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#7
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Member
Country: UK - England
Town: suffolk
Boat name: not yet
Make: Gemini
Length: 5m +
Engine: Suzuki 140
Join Date: Jan 2015
Posts: 1,293
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These people talk about making a dough for deeper gouges ,they will have all you need if you cant source locally https://www.ecfibreglasssupplies.co....gelcoat-filler
At the risk of maybe upsetting the purists i have had good results years ago on a sports boat with a tube of white plastic padding ! .
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20 April 2021, 20:56
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#8
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RIBnet admin team
Country: UK - Scotland
Boat name: imposter
Make: FunYak
Length: 3m +
Engine: Tohatsu 30HP
MMSI: 235089819
Join Date: Sep 2005
Posts: 11,626
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do you know how it happened? I've seen damage a bit like that on a badly set up trailer that let the boat move forward of the last transom roller. if its something like that - make sure you fix the problem too - or you'll be repeating it next week.
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21 April 2021, 09:23
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#9
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Member
Country: UK - England
Town: southampton
Boat name: TOP CAT 2
Make: Scorpion 8.1
Length: 8m +
Engine: 250hp HO
Join Date: Aug 2003
Posts: 1,822
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Agree. 7mm is quite deep, just using catalysed gelcoat might not last. Gelcoat is extremely brittle and has no strength. I would use a gelcoat filler, which will also eliminate any need for wax on top layer etc.
Don’t think they make plastic padding gelcoat filler anymore but there is still stuff out there and ec sell their own, it is thick and gooey and easy to shape. But quite hard to sand so don’t go crazy
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21 April 2021, 10:30
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#10
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Member
Country: UK - England
Town: Nottinghamshire
Make: Ranieri 15
Length: 4m +
Engine: Suzuki DF50
Join Date: Jul 2016
Posts: 1,280
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G-flex 655 thickened epoxy mixed with a few chopped strand matting fibres (cut down in length) would be the way to go in my book. The fibres add strength and stop the epoxy from sagging. Afterward go over it with Flowcoat (gelcoat with wax) and finish off through the grades and polish.
West Systems also sell a 501 white pigment which can be added to the epoxy, I get West Systems products from Amazon.
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21 April 2021, 11:12
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#11
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Member
Country: UK - England
Town: bournemouth
Boat name: fabiola
Make: ribcraft585
Length: 5m +
Engine: df140
Join Date: Apr 2013
Posts: 13
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How did the damage occur? If its a one-off and unlikely to get bashed again I'd try this first:
https://www.force4.co.uk/item/Plasti...oat-Filler/CP4
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21 April 2021, 11:25
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#12
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Member
Country: UK - England
Town: suffolk
Boat name: not yet
Make: Gemini
Length: 5m +
Engine: Suzuki 140
Join Date: Jan 2015
Posts: 1,293
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Quote:
Originally Posted by mal99
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I tend to agree with this way forward ,and for those who may need colour or even changing the shade of white ,i have seen it suggested to use a artist paint pallet of colours , however i cant recall whether it was watercolour or oil ?
much better option than £10 per pop trying designated gelcoat colours
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21 April 2021, 18:44
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#13
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Member
Country: UK - England
Town: Billericay
Make: SR 5.4
Engine: Evenrude E-tec 90
Join Date: Jul 2020
Posts: 62
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21 April 2021, 22:04
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#14
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Member
Country: UK - England
Town: southampton
Boat name: TOP CAT 2
Make: Scorpion 8.1
Length: 8m +
Engine: 250hp HO
Join Date: Aug 2003
Posts: 1,822
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Quote:
Originally Posted by Limecc
G-flex 655 thickened epoxy mixed with a few chopped strand matting fibres (cut down in length) would be the way to go in my book. The fibres add strength and stop the epoxy from sagging. Afterward go over it with Flowcoat (gelcoat with wax) and finish off through the grades and polish.
West Systems also sell a 501 white pigment which can be added to the epoxy, I get West Systems products from Amazon.
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I have had good and bad results with gelcoat over epoxy. Boatworks today did a great review of gelcoat over west epoxy that worked. Despite that he still doesn’t do it.
Have you used 501 white pigment succefully in open air? I found west pigment changed colour quickly as all epoxy does when exposed to UV. I’d be curious to know if you have a better technique than me, as I have a smal repair which would benefit from epoxy strength but is exposed to outside and UV.
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21 April 2021, 22:05
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#15
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Member
Country: UK - England
Town: southampton
Boat name: TOP CAT 2
Make: Scorpion 8.1
Length: 8m +
Engine: 250hp HO
Join Date: Aug 2003
Posts: 1,822
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Quote:
Originally Posted by Orwell boy
I tend to agree with this way forward ,and for those who may need colour or even changing the shade of white ,i have seen it suggested to use a artist paint pallet of colours , however i cant recall whether it was watercolour or oil ?
much better option than £10 per pop trying designated gelcoat colours
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That stuff works. It’s the plastic padding replacement I believe. An easy repair. It’s Highly unlikely a first timer will match pigment. It’s almost not worth bothering, a year later it all looks the same.
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22 April 2021, 20:13
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#16
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Member
Country: UK - England
Town: Retford
Boat name: Spy-sea-one
Make: Excel 435
Length: 4m +
Engine: Suzuki Outboard/25/4
Join Date: Oct 2011
Posts: 7,508
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Colour match will be very difficult since it’s now weathered even if you have the correct RAL number I would make the repair such that it looks like it an insert and should be there IMO
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