We own an older Alpine Meadows by Timberline. Last year it rained on us and it seemed that all the rain ended up in our tent. Does anyone know a good way to rewater proof a tent floor and fly?

There is a product called Tent Sure. It is made by Seam Grip Brands. Its very easy to use pour and spread. I used a paint brush but you could use a small paint roller. It works really good, I put it on my rainfly too. I have seen the stuff at Galyans, and at REI. Its about $10 a bottle a bottle will cover about 85 square feet. When it dries it looks just like the look you get with the bath tub tent floors.
qp

I have used Thompsons Water Seal (the same thing you use on decks) to seal seams in homemade tents before, and it seemed to work pretty good. I would be wary of applying it to a high quality tent as it is a oil based coating. Most tent manfacturers can supply a sealant compatible with their tents. A good all-around silicone based sealant is Sil-Net. But again, you need to know if your tent is water-proofed with silicone impregnated material. Kenyon makes a decent water-based sealant called reproof or something like that. It would be compatible with most any tent and possibly rain gear. Grangers North America makes a excellent polyurethane based sealant.
Bibler Tents also makes a product called Seamgrip. Anyway, I have tried all of these except the Bibler Seamgrip and have had good results. But based on Biblers reputation, i'm sure it gets the job done too.
best of luck
kclamken

heres a good article for tent resealing

http://www.backpacker.com/article/0%2C2646%2C633%2C00.html

I would use a spray product with a high percentage of silicone. Look for 15% and higher for a spray. Spray the fly and pay attention to seams. Do this a while before a trip and let the tent and fly dry thoroghly before putting it away. Use a painters plastic drop cloth on the inside of the tent under your gear and bags to keep water from seeping up through the floor-It is up to you if you want an outside cover under the tent floor-I do not, but thats me. Make sure the fly is taught and does not touch the inside of the tent-If the fly makes contact with the tent it will wick moisture even if it is well sealed. You may have to rig the fly more than what you read in the instructions if you expect high winds.

Good Luck and stay dry.