![]() According to West Systems, it is recommended to seal coat it with a brushed on layer of resin-hardener mix since sanding can leave open micropores where the balloons are sliced open. You can also use #407 Low density filler which is denser (and presumably harder) but also a little more difficult to sand and shape once dry. After drying, you can sand and drill the patch to make it seamless. Sometimes I add a bit of my own sawdust flour but I find that if I use too much of my own sawdust then the mixture ends up a bit gritty. You can adjust the thickness of the mixture based upon your needs. For the actual void filling, I add #410 Microlight filler (balloons) to the resin-hardener mix to get a thick buttery consistency that I then use to fill the void. One could dilute it a bit with alcahol to get similar viscosity and penetration to RotFix but tech support at West Systems recommends warming the wood (and/or the epoxy) as a *better* way of decreasing the viscosity and wicking in the epoxy (especially with warmed wood) without losing any of the epoxy strength that dilution would cause. For repairing rot, I first use unadulterated resin & hardener (typically mixed 5:1 for most hardeners) to penetrate and solidify the remaining wood borders (like RotFix). You really need to see the site for details. It consists of a single Resin (that I buy by the gallon), various hardeners (differing mostly in drying speed, but also some specialty ones) and a wide varierty of different fillers. Personally, while I still use SystemThree for some uses, I have "graduated" on to the more versatile West System. You can buy the SystemThree products in various sizes but like all epoxies, it's not cheap - expect to pay ~30-40 for each kit. More importantly, it can easily be sanded and drilled when dry to give you a seamless repair. Second fill and sculpt the void using the 2-part epoxy Sculptwood which comes in 2 plastic tubs of putty that you mix by rolling together into a ball. ![]() This saves you from having to cut back too far and is good insurance that you haven't missed some rot You let it seep into the remaining wood and harden. It is basically a thinned epoxy that penetrates and plasticizes borderline rotted areas. If you want something easy, then you might try the following products from SystemThree: - First use the RotFix 2-part epoxy to penetrate and solidify the borders of the rotted area.
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