We sell through Andy's bricks and mortar chandlery www.storrarmarine.co.uk loads of Plastic Padding Marine polyester filler as well as their white Gelcoat filler, both for use above the waterline. For below waterline applications, Plastic Padding's Marine Epoxy 'did' sell well however it's now been discontinued but hey folks don't panic... cos for those applications that require an epoxy filler we carry as stock items Hempel epoxy filler 130mlfor £17-95, International Watertite 250ml for £23-95 or my favourite Epifanes epoxy filler a whopping yes whopping 750ml for just £38-95 and yes its got an excellent shelf life!
What I like about the Epifanes product, apart from the fact it's very good value as can be seen above, when mixed it's an off-white colour, it doesn't shrink which some polyester fillers are inclined to do and it's easy to sand once cured! It is suitable to use on most substrates below and above water line including GRP, steel, aluminium and of course wood. Once mixed it's got a good pot life: 45minutes at 12 degrees.
When used above the waterline follow up with an application of Epifanes Multi Marine Primer (available in grey or white) if the filler is being painted over. Multi Marine Primer not only offers excellent adhesion to epoxy filler but to wood, fibreglass, stainless steel, aluminium, galvanised metal, copper and most other bare or painted substrates. Due to its clever formulation, it can even be painted over with two pack primer or finishes after a suitable time ie 48 hours!
If using any of the above-mentioned epoxy fillers below the waterline it is still recommended you prime the surface before applying your chosen antifouling. Epifanes epoxy primer is one that I have used on my last two projects with great success, however a ‘straw poll’ of two of the boat owing members of staff told me that Seajet Multipurpose Epoxy Primer was their product of choice! Once mixed it's easy to apply, my preferred method of application is a foam roller. The excellent concave roller sleeves that Andy retails are, in my opinion, superior to the standard ones in so much that they don't leave a 'tram line'.