はじめてのFRP施工全工程【初心者あるある】道具？材料？

This video is for those new to FRP construction. I used FRP waterproofing to repair a leak in my camping shell, but I made so many mistakes that it covered every common beginner's experience. I created this video as a reminder to myself to avoid making the same mistakes again. I've detailed and recorded the necessary tools, material characteristics and selection, and the entire construction process, including the mistakes I made. This is an introductory video, so I hope it will be helpful for those who are considering FRP construction. If you're wondering, "What am I doing? This is how it's done," I'd appreciate any advice or comments from experienced FRP users. The highlight of this video is the polystyrene resin. The first layer is a polystyrene resin applied directly to styrofoam. While regular resins dissolve styrofoam and polystyrene foam, polystyrene resin does not, so it can be applied directly. This makes it ideal for the polystyrene sandwich construction method. Once you create a shape with the polystyrene foam, it is then covered with the strong FRP, allowing for flexible shaping. By taking advantage of this advantage, even complex or arched shapes that are difficult to forge, such as those that require strength, can be created by simply shaping the Styrofoam and then applying a polystyrene resin. I felt the great potential of being able to create something practical and strong by simply shaping it to fit my imagination. I used to think that building camping shells would only allow for simple shapes, but with this method, I feel I can design freely and creatively. I would like to try making a camping shell using this method someday. This camping shell was built in 2019 using the Styrofoam sandwich construction method. Below is a playlist of videos related to camping shells. I hope you enjoy watching them.    • キャンピングカーDIY   Below is a summary of what I've learned about FRP construction. FRP Basics 1. What is FRP? Fiber Reinforced Plastic = Fiber-Reinforced Plastic A glass fiber mat is impregnated with resin to form a single unit. The resin is typically unsaturated polyester. Chemical-resistant vinyl esters are also available, but these are expensive. When a hardening agent is added to this resin, it hardens within 10 minutes. Normal resins already contain additives, making it a two-component system where only the hardener is added. However, polystyrene resins do not contain additives, as they tend to gel. In other words, polystyrene resins are three-component systems, so the additive is added first and mixed thoroughly before the hardener is added. Adding them simultaneously will cause the resin to overheat and begin hardening immediately, which is dangerous and makes the resin unapplicable. Never use the same dropper for both the additive and hardener. Direct mixing of the undiluted solutions will result in a fire. Polystyrene resin can be diluted with any alcohol-based solvent that does not contain water. It can also be diluted with ethanol or IPA. The resin surface becomes sticky when exposed to air and does not harden. It hardens solid if exposed to air. If paraffin wax is present in the resin, it comes to the surface and hardens without exposure to air. Non-paraffin: The surface remains sticky even after hardening, making it suitable for layering. In-paraffin: After hardening, the paraffin comes to the surface and becomes dry, making it suitable for finishing. 2. Surface Preparation (for Styrofoam) If a silicone sealant is applied as a base, it has strong release properties, and if resin is applied on top, it will peel off and not harden. Therefore, it is necessary to completely remove the applied silicone sealant. However, in actual practice, the high viscosity caused the resin to adhere to the silicone sealant. It is not necessary to completely remove the silicone sealant. 3. Mixing the Hardener The basic rule is to mix in 1% hardener by weight (0.5-1.5% depending on the temperature). In practice, it is fine to use volume (cc) as the weight, so you can measure it with a dropper. When the temperature is high and you are unfamiliar with the process, 0.5% is probably fine. A flat, silicone-like spatula-like tool works well for mixing, mixing thoroughly from the outside in. A round bucket is best for the container, even if it's a roller (a square one isn't recommended). 4. Placing the Glass Mat Glass fiber count is expressed in grams per 1m². It tears easily, so if you loosen the edges and stack them, the seams won't be visible. It stings on the skin and is not good for inhalation, so rubber gloves and a mask are required. Before placing the glass mat, lightly apply resin with a roller to prevent it from slipping. 5. Applying the Resin (Infiltration) Place resin under the mat first, then apply resin on top of the mat. Spread the resin with a roller. Never press down or stretch it, but allow the resin to infiltrate t...