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Old 14 January 2004, 07:43   #11
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Country: UK - Scotland
Make: HumberOceanOffshore
Length: 8m +
Engine: Volvo KAD300/DPX
Join Date: Oct 2002
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Look out, big head has arrived.

Sorry to tell you, but you may not have been successful. Leave the aluminium open. The more is it open to oxygen the thicker the protective layer, albeit slowly, will develop. Aluminium oxidises instantly in contact with oxygen(air). The paint will not adhere properly and Hammerite in particular will not stay there for long. If fact, it used to say on the Hammetite tin that it is not suitable for use on aluminium. You can paint aluminium with etching primer, which is designed to improve the adhesion, followed by top coat. Perhaps that is what Charlie has done, in which case, just ignore me.

Removing stubborn screws.... the aluminium is sacrificial to the stainless screws so corrosion around them will be at its greatest. Get a good fitting pozidrive screwdriver, hold the screwdriver in your left hand as though it's a dagger (presuming you are right handed), place it into the screw head and whilst undoing the screw hammer the end of the screwdriver to apply a shock load to the screw. Of course, if you've previously chewed up the head it'll be more difficult, in which case, hit the screwdriver into the head before attempting to undo the screw by the obove method.
It's just a crude version of an impact driver, but it works.
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Old 14 January 2004, 08:31   #12
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Country: UK - Wales
Town: Southampton
Boat name: DynaMoHumm/ SRV/deja
Make: Avon8.4, 5.4 & 4.777
Length: 8m +
Engine: Cat3126 Yam 90 &70
MMSI: 42
Join Date: Dec 2003
Posts: 6,556
Yes it's goes quite well at the moment, but give me time and I am sure 1'll get to the engine
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Old 14 January 2004, 09:05   #13
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Old 15 January 2004, 03:15   #14
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Country: UK - England
Town: Whitstable
Boat name: Tango
Make: Avon and Narwhal2.4m
Length: 4m +
Engine: 60HP Yamaha
Join Date: Oct 2002
Posts: 966
Keith.... Dont worry mate every time i look at my boat something new has rotten or corroded away, seems to be a fact of life if it goes anywhere near the sea it corrodes, dont think your'll ever beat it, just look at the Mary Rose.

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