How to waterproof MDF speaker rings? Plywood any better?

Any type of wood it will expand, start to stink afer awhile, deteriorate, etc. when exposed to any type of moisture.

Best bet is to use some plastic or nylon speaker rings.

Spray the ring with protective stuff like bed liner or any paint that makes it waterproof.c bondo body filler or fiberglass works as well.

Would you have to do any prep work or could you just spray some bed liner right on?

what he said rhino liner will help a huge amount

possibly flex seal too

The problem with spraying on a coating is the second you put the screw into the wood you expose a hole, trust me, moisture will get in. Many home depots now carry 1/2" PVC sheet, this is a good choice.

I used bed liner. After predrilling holes for speakers I sprayed them again. Made sure to get in holes and boom solid as a rock...

All windows leak from rain,or collect some type of moisture, thats why they have drain holes in one corner or both..even if the seals are tight, we still roll our windows down at some point and break that seal.best thing to do is todip the MDF in a waterproofing sealer, and seal with an apoxy coating,and it will be just about water proof/bullet proof, yet, prepping the upper cut out with some deadner or Foil tap to make a half moon shaped deterrent on the inside of the door cavity will keep alot of the water from falling directly on the speaker and use ABS plastic or a couple ring spacers on the inside to pull the speaker more into the inner portion of the cabin space away from the door cavity

after predrilling holes I resin em. it's worked well for me

Just use different wood. Mdf svcks.. I have birch that been sitting outside for two years in straight rain and snow and everything and it's still solid.

I use abs plastic for thinner ones and hdpe plastic for thicker ones. You can use plastic cutting boards from Walmart, they are hdpe.

I use abs plastic for thinner ones and hdpe plastic for thicker ones. You can use plastic cutting boards from Walmart, they are hdpe.

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This^^

I'm cutting mine out of aluminum on our waterjet. Problem sloved.