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Old 21 October 2012, 09:28   #1
Country: UK - England
Town: Gloucestershire
Boat name: Osprey
Make: Osprey Vipermax
Length: 5m +
Engine: E-tec 300 G2
Join Date: Dec 2006
Posts: 4,019
Best GRP Polish

Boat Marine 3M Gelcoat Cleaner & Wax - hull gelcoat grp protect polish 500ml | eBay

Anyone used this 3M stuff?

Its not for scratch removal just to bring back the shine..

Or there is this

Crystal Glo Marine Treatment Acrylic Boat Yacht Hull Gelcoat Gloss Polish 1L | eBay


Meguiars Boat/ RV Polish Polish M4516 | eBay

Chris Stevens

Born fiddler
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Old 21 October 2012, 09:54   #2
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Country: UK - England
Town: The wilds of Wiltshire
Boat name: Dominator
Make: SR5.4
Length: 7m +
Engine: Yam 85
MMSI: 235055163
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Posts: 13,001
If it's gone dull, you need to use an abrasive/scratch removing polish to bring back the shine before you wax it/polish it with anything like that.
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Old 21 October 2012, 10:04   #3
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Country: Ireland
Length: no boat
Join Date: Feb 2008
Posts: 14,432
I used 3M Machine Polish when I couldn't find anything else - it produced a lovely glossy finish and was very easy to work with.

I'm not sure how abrasive it is, but it lifted my GRP to "new" look. It had been very dull beforehand.

I sealed it afterwards with car wax.
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Old 21 October 2012, 10:16   #4
Country: UK - England
Town: Hamble
Length: 9m +
Join Date: Dec 2002
Posts: 2,317
I use this on all my mouldings, really easy to use with a superb finish. Compounds : Fibreglass kits supplies, Epoxy Polyester Resin, Gelcoat, Acetone, AS Composites UK
It is better to remain silent and be thought a fool, than to speak and remove all doubt!
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Old 21 October 2012, 12:00   #5
Country: UK - England
Town: Mighty Penryn
Boat name: Little Joe.
Make: Avon Searider
Length: 4m +
Engine: Honda BF50
Join Date: Aug 2005
Posts: 8,869
3m Finesse it compound applied with a machine polisher/supermop. 3m Finesse hard wax to finish. The result will be 'as new'.
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Old 21 October 2012, 22:29   #6
Country: UK - Scotland
Town: Edinburgh
Boat name: D Hollins
Make: pacific 38
Length: 10m +
Engine: Twin 212 hp Diesel
Join Date: Dec 2001
Posts: 176
Several common abrasive systems can be used, some such as Farecla Automobile range (G3, G6 etc) are more or less the same as the Farecla marine range (Profile 100, 200 etc) and there are loads of other similar products available. The main thing with an abrasive is to use the correct one , and if the scratches require a coarse abrasive then they must be followed up with a finer compound.

Most important after doing all the cutting back work (and often forgotten) is the wax application. Several coats are best, the wax does not require to be anything special, simple GRP moulding hard wax will do, but it must be left on to dry before buffing bac and several coats applied.

This is bac breaking work and there is no easy way to do it. However if this is done the Gelcoat will be back like new and it will be protected from oxidization by the wax that you have put on.

Good luck !

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