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I have heard that folks prepare MDF by painting it with a non-water based primer. Which, essentially, seals it from water. Examples include West System epoxy and Bullseye shellac. I do not have experience with doing that. (I should try!)
The advantage of plywood is that it does not deform when water is added. And most terrain modeling is going to add water at some point or another. So, I would go with ply even if cost were not an issue.
MFT My Fabulous Table
Mini weather station with Attiny85
Hack a Drill - Powerful Gearmotor!
Add Bluetooth to any dock, stereo, speaker.
Small Electronic Experiment Station
Easy Benchtop Power Supply
Finishing and Detailing a Sculpey (Polymer Clay) Sculpture
Make Your Own Desktop LED Lamp
Hot Wire Ice Cutter
Adhesives 101: How to glue...
Paper Privacy Windows (window frost like a boss)
'Viking' beer mug (no power tools - the bushcraft way)
Password protected sketchbook
Multitouch Music Controller
BACKPACKING: WHAT TO BRING
Improvised Safety Guard for Rotary Tool
Easy Build Burning Laser For Less Than $20
Mini circular saw with dc motor
Wind powered Composter - The Green Twist , Exactly
Model complex solid shapes with cardboard.
Mini Adjustable Voltage Regulator
DIY Small Bench Power Supply
Razor Blade Cutter
Simple Plywood Cutting Table / Work Table (Updated)
Universal Portable USB Charger
Tools for the Electronics Hobbyist
Inexpensive Mini Turbine
Phone line electricity.
How to plan and carry out a project or assignment
The Ultimate FM Transmitter (Long Range Spybug)
Sculpting with Polymer Clay
Preserve Your Own Animal Skull
I Love Papercrete
Adirondack chair from ONE board
Concrete Garden Bench
The Two-Weekend Table
555 Pocket Synth/Keyboard
Make a Center Finder
Homemade center finder tool, quick, cheap, easy.
The Saw Blade Cabinet
basic photo editing
Mjolnir - The Portable Media Computer
Modern Industrial House Numbers
Create External Buttons For Your Keyboard
How to Make a Go-Kart
Functional and Sturdy Wooden Toolbox
Work/Play TV Tray
Maker Station: The Portable Reconfigurable Work Station for all Makers
Cardboard wind generator for models
BH-1 Mobile Work Station
Portable Work Station
Make a Portable Workstation
Rapid Fire Mouse Button
The Inexpensive Dremel Foot Switch
PVC Dremel drill press
Make your own smart watch
Letz build an Ironman mark 7 paper model (no pep)
Skyrim Nordic Helm (mark2)
Lingerie chest from reclaimed wood
Salvaging Liquid Crystal Displays (LCDs)
Travel PC table for commuters
Midi In Me Kit: Midi to Breadboard Access
Turn Me Kit: Rotary Encoder to Breadboard Access
Simple Led driver/Constant-current source 20 mA
Your Image on an Arduino! - TFT LCD Screen Guide
Park and Beach Bicycle Trailer
Oat Spike Paracord Bracelet
Designing and building an synthesizer with Meeblip and Arduino, added videos!
How to backpack better with a hammock
How to properly pack your pack in preperation for an amazing backpacking trip
Camp cooking the easy way - In ground roast
EUROPEAN 6-IN-1 CHAIN MAIL BEGINNER'S GUIDE
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