A Photo & Discussion Forum for Wharram Design Enthusiasts
hello there guys what about talc powder? ithink i heard someone use it before but it may be heavy and not too cheap.
you can 'sweat' the fillet with a layer of thick plastic over the fillet as it cures. This is most effective when reasonable temps can be had. The plastic is put on the fillet, and then worked with flexible bit of rubber (like a thin spatula) over the fillet causing both bubbles of air to emerge, and a layer of resin at the top, smoothing the product. Try a lump between plastic (like thick contractor trash sack 3 mil or higher) on one side and news paper on the other. The newsprint will compete with the fillet for resin, drawing some up. But with it, the material absorbs and bonds. But it is thin, and easily sanded off. Try a bit to see which effect you are after, shiny or matte.
I mix wood flour with silica for strong filletes and bonding. . I never use saw dust (to big particles) but only sanding dust caught up in the little bag of the sander. Different woods allow for color variations of fillets. Even though the sawdust looks and feels very smooth when it comes out of the sander`s bag I always sieve it through a rather fine household sieve before I use the sanding dust. It is surprising how many large particles and longish pieces one finds in the sieve. Avoiding 'large' pieces in the wood flour make for smoother fillets, I find.
Another option would be to omit the fillets altogether, take a step back in boat building tradition and use solid wood chines instead.
The pros : you'll use a lot less resin, no need for additives, you can use a cheaper marine adhesive like Balcotan or Resorcinol, no need for glass tape, all in all it's a lot cheaper.
The cons: it will test your wood working skills and it is a lot more time consuming, with Resorcinol, gaps can't be any greater than 1mm, Balcotan is more forgiving. you'll need fasteners like screws or ring-nails for reinforcing in the absence of glass tape.
On the little dinghy I made last summer I made fillets out of wood flour and then when it got partially cured I followed Boatsmiths recommendation of smoothing them with denatured alcohol. It worked quickly and gave amazingly smooth fillets that required no or minimal sanding.
Perfect considering Nevs allergies.
I just put on a pair of gloves, poured a little bit of alcohol in a cup and rubbed it on with my finger. That way they got really smooth. This works even if they get stiff - just rub harder... It did not change the color of the fillets at all.
I left my dinghy wood colored on the inside - lots of varnish which quickly disappeared as Jeff treated her like the work horse she was supposed to be. Drat. Wanted a work of art that was not to be.
Right now she's sitting in the garage of our rental house in Florida awaiting refinishing. And all 5 of us are sitting in a car driving north to Michigan for son #3's wedding. Time just seems to be whizzing by faster than I would like!