Quote:
Originally Posted by Big fish
Can I use poly resin and mat on skin to build some thickness? Then do what you did with epoxy for the core.
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You could do that, and it might be fine, but that kinda defeats the purpose of using epoxy to get the good secondary bond to the old skin. If I was to fill all the voids and dips with matt and poly or VE I would just continue to work with that same resin and lay the core into the boat while the resin was still green. You get a better bond when you do a green or chemical bond. The peel strength is much higher and you will get less delamination problems. The part of the lay up that will be the weekest is the bond to the older orignal poly glass. The point of using the epoxy is it will give you better secondary bond strength to the old poly skin. If you lay poly on the old skin it wont have the same peel strength. You would be just as good or better off to continue with the poly and do a full wet chemical lay up all the way out vs letting it fully cure then doing a secondary bond on top of the new glass. The window for a lay up is best if it cures all together but you still have hours to a day or two to reapply more resin and glass and still get a good green chemical bond. If it was me I would do one of two things, First- use epoxy to to fill the voids and build it back up with 1708 stitch cloth and then lay the skin in place so it is all epoxy from skin to core. Then you can switch to poly or ve to do the rest on the outer core to save some money if you must. OR secondly- use VE or poly to fill the voids and dips with matt and 1708 and do a full green or chemical bond from the start to finish all the way out. You just need to take more time prepping the surfaces on the old skin before you start. Scuff it up well so it has plenty of tooth for the new resin to bite into and clean it very well and get the best bond you can out of the resin. I think as long as you prep the surface well and use enough biaxel cloth for strength you will be plenty strong and you wont have any problems with delamination or such. Just take your time and make sure you get all the air out of the laminate and leave no air pockets or spots for water to get into the core and it will last for years with out issue. There have been many boats rebuilt with just plain old poly resin that last years. The epoxy and VE are much better products and will give you more strength but at a cost. If you are trying to get the most strength out of a light lay up for performance high end resin systems is a must but just for a pleasure fishing vessel where weight is not a issue you can over build it with poly a little for peace of mind and be fine.