Reinforcing ?, ya I know......

[Kny21]

I'm in the midst of my winter project, reinforcing just the engine compartment of my RN SJ. I've basically found all what I need from searching PWCT and whatnot but wanted to follow up on a couple of things I'm still unclear on or more or less nervous about since this will be my first time working with any of this.

I have the rails ground down and need to start preppin' the hull for the next steps. I was going to use a orbital sander to rough everything up and then go over by hand to get the smaller areas. What grit paper is good to use, 400? Clean-up would be vacuuming, wet-wiping the rest of the dust, then acetone wipe down. Is anything else crucial needed?

I'm pretty square on what I need for strengthening materials, just unsure on how much epoxy resin (105) & slow hardener (206) I will need..... I plan on using 17oz Biax to do 1 layer on the sides and up the nose and 3 under the hand pole since that area is small and 1 on the firewall for limiting rope mount strength. How much would you guys say is needed for this and to use with bond rail filler? And should I do 2 layers of biax on the sides?

Can Microlight (410) be used instead of the sillica?

Thanks,

 

[beachedflunkey]

A gal of resin should definitely do it. I used fast hardener in the cooler Fall (60-70deg?). I also used silica filler. 80 grit all around the inner hull. I also ran 2" tape all under the rails and around the inner lip of my hood. Sounds like you are straight on the rest.

 

[jetskiking]

I used 60 grit on the inside of my hull. The rougher it is the better it will bond. Also a gallon should be plenty. I just did footholds and reinforcement and a gallon was plenty. Three layers of biax under the nose seams like alot. I used 12oz biax and thats pretty thick stuff. I wouldnt do two layers on the sides that would be alot of weight. I did one layer of 12oz biax and one layer of 5.5oz carbon so I only have 17oz of buildup on the sides and it is solid.From everywhere I read it seamed like 12oz was enough everywhere I only added carbon for a little bling.