12-05-2010 11:41 AM - edited 12-06-2010 08:17 AM
Welcome to the community - we are glad you found us.
Generally speaking, the temperature needs to be at least 40 degrees. There are a lot of variables that go into applying stain to the siding:
- Surface temperature - has the surface had time to get caught up with the air temp?
- Temperature change - will it be dropping any lower within 2 hours?
- Surface condition - has it ever been stained before? Is it wet?
- Sun or shade - if the side is in direct sunlight, then it's possible to apply the stain at a lower air temperature. If it's in the shade, then that side may not warm up in time.
- Quality of product - always check the label. Most cans will tell you the range in which the product is best applied.
Stains are a little more forgiving than paints. Paint forms a film on the surface that acts as a protective "membrane" and takes longer to "cure". Stains, by design actually soak into the pores of the wood and dry quicker because there is more area to absorb.
Hope this helps. You definitely don't want to have to re-do this project - so good luck on this one.