Thank you for the input I'll give the International a spinBear in mind that epoxy such as West will set quickly so doing a large area could be an issue. A slow epoxy is probably available. We have been using the Internaitional product which we bought cheaply, it's years old but keeps working and has a long set time.
There is colloidal silica and glass microballoons as well as Talc. The International keel filler is definitely Talc based.
I quickly googled the boat. Looks like a fairly standard keel. Most likely cast iron.Hi Ceirwang
Fairing in a Dehler 36 keel to hull it has always been done with Sikaflex but the finish has never been achieved even when wet and dry sanding, using all recommend grades. As to the amount of movement this is up for debate.
I had a quick google & this study seemed to indicate that Talk in a polyester resin made a large difference t o the water uptake, naturally it would be less with epoxy, but why take the chance when you can buy a big tub of something more suitable for underwater use from most online distributors for very little indeed?It's fairing we're talking about. Fairing a keel is basically a similar process to using car body filler on a car. Talc is the thickener. The filler can be finished to a very high standard. It doesn't sang if correctly blended.
The keel Hull joint is a different animal and a different material is needed.
It matters not if the Talc is permeable or not as it will be applied to a primed keel and will be overcoated. As the Talc is embedded in epoxy I don't believe there will be much, if any, permeability.
Thank you for heads up, will call, them this particular area has always niggled me.Call CFS Fibreglass Supplies on 01209 821028 and tell them what you want. They have a big range of fillers. There's a chap there is a wiz on mixing them to get the result you want.
I wanted an easy to sand fairing for my keel. He gave be 3/4 miro-balloons + 1/4 colloidal silica to prevent sag.