My mold is re-usable with a little repair. I'll try putty in the corners if I do a second hull. Thanks, Frank.
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Frank Pittelli Sent: Saturday, March 28, 2015 11:42 AM To: [email protected] Subject: Re: [TANKS] Small Fry fiberglass hull I can assure you that your first-time result is *FAR* better than mine (for which no pictures will ever be found on the Internet ;-) Good job. Those corner voids are usually not caused by improper rolling, they are usually caused by the material/resin pulling away from the corner because of surface tension during the curing process. That's where an initial bead of epoxy and filler (glass fibers, micro-balloons, wood flour, saw dust, kevlar pulp, etc) is used. Mix the putty to a consistency of a creamy peanut butter. Just put a small bead of putty in the corner after spreading the initial coat of epoxy on the mold, but before laying in the first layer of mat. The putty will squeeze out as you roll the mat in, but it will always fill the corner, producing a sweet edge when you pull the part out of the mold. I use kevlar pulp almost exclusively for that purpose, because it yields a rock-hard, extremely durable corner. Don't take too long spreading the putty and laying the first layer, because the putty cures faster than resin by itself. With regards to filling the voids. If you used "epoxy resin" for the molded part, then just create a putty from the same epoxy resin using a filler (see list above). Epoxy always sticks to itself. If you used "molding polyester resin" (which does *not* include wax), then both epoxy and polyester putty will work fine for the filler. If you used standard "polyester resin" (the stuff from auto parts or marine stores) it contains a "wax" to help it cure. So, you'll need to rough sand the void to remove the wax layer before filling will either epoxy or polyester putty. (FYI: Bondo is a polyester putty). When making your own putty, mix it to a consistency of a stiff peanut butter. -- -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] Visit the group at http://groups.google.com/group/rctankcombat --- You received this message because you are subscribed to the Google Groups "R/C Tank Combat" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout. -- -- You are currently subscribed to the "R/C Tank Combat" group. To post a message, send email to [email protected] To unsubscribe, send email to [email protected] Visit the group at http://groups.google.com/group/rctankcombat --- You received this message because you are subscribed to the Google Groups "R/C Tank Combat" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/d/optout.
