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Old 26 August 2015, 12:09   #11
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Many thanks to everyone 👍
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Old 29 August 2015, 07:55   #12
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There is no need to add wax to the gel coat to exclude the air since you're removing the surface anyway. The surface will be tacky but it will be cured properly below the tackiness.
But you will clog your sandpaper as dust will stick to it...
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Old 29 August 2015, 08:06   #13
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But you will clog your sandpaper as dust will stick to it...

Not if you use wet & dry with a hint of Fairy liquid


.....sh1t happens.......
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Old 29 August 2015, 08:30   #14
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But will the tackiness not stick to the sandpaper? So the extra dust tends not to stick but in my experience of trying to use gel as flow your sticky gel surface still sticks to the paper and so you stop sanding because the sticky layer clogged the 'sand'
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Old 29 August 2015, 08:38   #15
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But will the tackiness not stick to the sandpaper? So the extra dust tends not to stick but in my experience of trying to use gel as flow your sticky gel surface still sticks to the paper and so you stop sanding because the sticky layer clogged the 'sand'
not if you sand it wet I only ever use gel coat, once you knock the initial layer back with some 400 grit wet & dry, there is no sticky. I just work down the grades to 1200 grit always keeping it wet with aforesaid hint of Fairy. Then I use the Fein with a polishing pad & cutting compound. Finish with a polish of Mer.
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Old 30 August 2015, 14:25   #16
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I find sanding wet gel is always like two steps forward. One step back. Despite soap and all the other tips.

Also if the gelcoat chips are deeper than a couple of mm. I'd be careful using in filled gelcoat. Just from my hobbiest experience
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Old 30 August 2015, 18:52   #17
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I find sanding wet gel is always like two steps forward. One step back. Despite soap and all the other tips.
I must be doing something wrong then
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Old 31 August 2015, 03:03   #18
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gtflash - the gelcoat chips I'm filling are on the chines so are quite thick/deep. They go to the fibreglass beneath but not in to it. The gelcoat is more than 2mm - more like 4mm

If the gelcoat I'm filling is more than a couple of mm, why would you not fill with the same material? Would you be filling up the chip to 2mm shy of the surface? If so, why, and with what material? Thanks
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Old 31 August 2015, 03:16   #19
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The chips are about the size of a fingernail. I haven't properly investigated yet but I have seen 2. Beached on coarse sand but over the only rock on 500m of beach. 😡
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Old 31 August 2015, 03:44   #20
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The fingernail size is fine. The deeper they are the more likely that as it cures it shrinks leaving space between fibre and gel unseen until a little knock makes it fall out. Building up in layers will solve that. Or fill with an epoxy filler and surface with gel. Or you can mix some chopped strands (East Coast sell them. Get the smallest, finest you can get) which will give the gel some extra strength. But still finish with plain gel. I doubt 4mm is deep enough for that.
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