How to eliminate pin holes in planking

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19 December 2015 at 13:04 #62184
Jeremy
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@jeremy15845
I have just completed the second (Mahogany) planking on my Amati Riva Aquarama. To ensure good contact with the first planking, I had to use a lot of pins. Now I need to eliminate or disguise them, but the question is how. I have tried A J Perkins water based filler which is cream in colour, over painted with Mahogany water based stain. Next, I will try mixing a bit of the stain into the filler before applying it and/or I could mix in a bit of Mahogany powder, sanded from the planks. As the planks are much lighter coloured than the sheets on the top of the hull, I am minded to stain all the planking to make it darker. Any advice on the best way to proceed would be much appreciated.

Jeremy
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19 December 2015 at 13:04 #6220
Jeremy
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@jeremy15845
19 December 2015 at 15:43 #62186
Paul T
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@pault84577
Hi Jeremy

Save the mahogany sawdust and mix it with waterproof PVA to make a paste. Use this paste as a filler, let it dry then lightly rub down. This will give you the correct coloured filler that can be used in holes up to 10mm dia.

Paul
19 December 2015 at 20:00 #62196
Dodgy Geezer 1
Participant
@dodgygeezer1
You could start with just plain water. A drop of water on each hole will swell the wood locally, and close the hole up a bit.

It completely closes it on balsa. I don't know how well it will work on Mahogany, but it can't hurt to try it..

See here (bottom of the page) **LINK**
19 December 2015 at 20:36 #62198
Charles Oates
Participant
@charlesoates31738
Here’s what I have done many times, perfect results.
Put a slight dab of pva on each hole with your finger, do a group of several in one area at a time. Leave it fot a couple of mins, then wipe off the excess with your finger again, leaving some pva in the hole. Then sand that area lightly so the dust is pressed into the hole as you sand. Leave to dry.
Voila.
19 December 2015 at 22:23 #62199
Master Shipwright
Participant
@mastershipwright
The sawdust + waterproof PVA method works fine.
22 December 2015 at 17:59 #62251
Jeremy
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@jeremy15845
I've tried Charles's solution and the holes are filled. However, where I have wiped off the excess PVA (DeLuxe materials Speedbond), it has left darkish halos round the pin holes which light sanding has not removed . Should I sand more or leave it? Maybe, when varnished, these slight discolourations will not be noticeable. Thanks for all the advice.

Jeremy
22 December 2015 at 19:15 #62253
ashley needham
Participant
@ashleyneedham69188
Jeremy. I cannot see, apart from swelling up the holes to close them, that you would be able to fill the holes and they would not be seen at all, they are too regular and distinctive a feature for that. It does strike me that they are on a slightly lighter plank than most, possibly a tiny drop of stain would assist?? Other than that, I would give them a good sand, after all you have nothing to lose!!

I have a slight split in the veneer and a slight gap in the join on mine and I am using just varnish to rectify this, applied by brush to build up locally and let dry before sanding and hopefully this will hide the gaps, before continuing with the rest of the varnishing.

Ashley. Usual disclaimer, personal opinion and so on
22 December 2015 at 19:37 #62255
Paul T
Participant
@pault84577
Jeremy

I believe that Speedbond has some kind of solvent in it and this could create the problem that you have encountered. The solvent would be sucked into the timber pores and produce this black ring, unfortunately if this is the cause then the stain is likely to extend through the full depth of the wood and consequently sanding might have little effect.

Paul
22 December 2015 at 20:57 #62258
Jeremy
Participant
@jeremy15845
Paul

Thanks for the warning. I have contacted DeLuxe materials to ask if Speedbond contains a solvent which might discolour the wood, so we will see what they say. The bottle claims that it is 100% pure PVA. Sanding has reduced the staining and I hope that, once varnished, it will not be noticeable, particularly if I darken the planks with a water based Mahogany stain.

Jeremy
23 December 2015 at 00:21 #62266
Charles Oates
Participant
@charlesoates31738
Hi Jeremy, sorry to hear about the dark rings, I’ve never had that. The pva that I use is a cheap one I buy localy ( Spain) but I used to use one from a local diy shop in uk.
Why not try the same on some scrap, then varnish and check the results. Worth a go before resorting to stain, which I’m not keen on.
24 December 2015 at 16:29 #62305
Jeremy
Participant
@jeremy15845
I have eventually resorted to using Rustins teak coloured plastic wood to fill the pin holes – the mahogany colour was far too dark. This product didn't stain the planks and the colour match is reasonable. On closer inspection, some pin holes remain to be filled.

I got a reply from DeLuxe Materials and, not surprisingly, they suggested using another of their products, Brush Magic, to dissolve the PVA. They didn't answer the question as to whether SpeedBond contains a solvent.

Thanks to all for their advice.

Jeremy
24 December 2015 at 19:42 #62306
Paul T
Participant
@pault84577
Jeremy

This is a link to deluxe materials uk website **LINK** but the site doesn't give COSSH data. However this site in Australia does give the technical data **LINK**

I'm not a chemist so I cant tell you if any of these substances would cause the dark ring reaction but someone else might be able to help you.

Paul
25 December 2015 at 09:05 #62308
Jeremy
Participant
@jeremy15845
Paul

Thanks for that. Butyl alcohol is a solvent but, at 1%, you would hardly expect it to have much effect. Anyway, not to worry now, as filling the pin holes with plastic wood has worked a treat.

Jeremy

Edited By Jeremy on 25/12/2015 09:05:57
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